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The relationship between lifestyle components and dietary patterns

Published online by Cambridge University Press:  01 April 2020

Andreea Gherasim
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
Lidia I. Arhire*
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
Otilia Niță
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
Alina D. Popa
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
Mariana Graur
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
Laura Mihalache
Affiliation:
‘Grigore T. Popa’ University of Medicine and Pharmacy, Faculty of Medicine, 16 Universității street, Iași 700115, Romania ‘Sf. Spiridon’ Clinical Emergency Hospital, 1 Independenței boulevard, Iași 700111, Romania
*
*Corresponding author: Lidia Iuliana Arhire, email lidia.graur@umfiasi.ro
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Abstract

We conducted a narrative review on the interaction between dietary patterns with demographic and lifestyle variables in relation to health status assessment. The food pattern has the advantage of taking into account the correlations that may exist between foods or groups of foods, but also between nutrients. It is an alternative and complementary approach in analysing the relationship between nutrition and the risk of chronic diseases. For the determination of dietary patterns one can use indices/scores that evaluate the conformity of the diet with the nutrition guidelines or the established patterns (a priori approach). The methods more commonly used are based on exploratory data (a posteriori): cluster analysis and factor analysis. Dietary patterns may vary according to sex, socio-economic status, ethnicity, culture and other factors, but more, they may vary depending on different associations between these factors. The dietary pattern exerts its effects on health in a synergistic way or even in conjunction with other lifestyle factors, and we can therefore refer to a ‘pattern of lifestyle’.

Type
Conference on ‘Malnutrition in an obese world: European perspectives’
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Authors 2020

Historically, nutritional literature has often reported on issues regarding the role of individual nutrient on health, but not all nutritional compounds in foods have been fully studied. The nutrient composition of foods varies considerably, and there are probably synergistic interactions between the nutritional components within any food, a topic that has been increasingly talked about lately(Reference Jacobs and Tapsell1). Moreover, difficulties related to these interactions are also reflected in our present knowledge about the dietary patterns that people commonly consume. However, dietary patterns should be included in the development and implementation of nutritional guidelines, which could improve the chances of preventing non-communicable chronic diseases(Reference Tapsell, Neale and Satija2).

It is worth mentioning that diet, as a lifestyle component, exerts its effects on health in a synergistic way or even in conjunction with other factors, which would not be reflected by examining each individual factor in isolation(Reference Al Thani, Al Thani and Al-Chetachi3Reference Naja, Itani and Nasrallah5). In nutritional research where only individual life factors were investigated, sophisticated statistical methods such as linear and logistic regression models have been selected to take into account the interaction and synergistic effects between these factors(Reference Hankinson, Daviglus and Horn6,Reference Kant7) .

The prevalence of chronic diseases increases as countries develop and become more industrialised. These diseases include obesity, high blood pressure, CVD, type-2 diabetes, neoplasms and many more. Dietary patterns play an important role in health and therefore in the prevention of chronic diseases(Reference Einsele, Sadeghi, Ingold and Jenzer8). Dietary patterns could as such provide a clearer, more accurate picture of a person's eating behaviour(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9). These models represent the interaction of all food choices that form a complete food pattern. These patterns are influenced by many factors, such as climate, demographics, religion, culture and others(Reference Einsele, Sadeghi, Ingold and Jenzer8).

The WHO considers diet to have the most important role in the prevention of chronic diseases and to be one of the most important lifestyle factors, emphasising the importance of understanding its complexity and its relationship with chronic diseases(Reference Jessri, Ng and L'Abbé10). In addition to the unhealthy diet, the WHO identifies other important behavioural factors, such as physical inactivity, smoking and increased alcohol consumption as common risk factors for chronic diseases(11,12) .

Diet is one of the modifiable behaviours that can help reduce cardio-metabolic risk and prevent chronic diseases, so an assessment of the general dietary intake of the population becomes essential(Reference Schwingshackl, Bogensberger and Hoffmann13).

However, it is imperative to investigate the lifestyle pattern as a whole, in order to better understand its implications on health and disease(Reference Naja, Itani and Nasrallah5). The aetiology of chronic diseases is complex and depends more on exposure to more overlapping/cumulative environmental factors rather than on exposure to a single factor, so the adoption of such holistic integration is encouraged. In fact, several prospective, or randomised, epidemiological studies have shown that these modifiable environmental factors, mentioned earlier, are all involved in the prevention and/or management of chronic diseases. There is also a lot of research on the association between each of these factors taken individually and in various chronic diseases. However, lifestyle factors most often exert their effects in a synergistic manner, a fact that would not be clear when studying each individual factor(Reference Naja, Shatila and Meho14).

Compared to the classical methods used in nutritional epidemiology, the approach of the lifestyle pattern confers a holistic representation in investigating the predisposing factors for the emergence of non-communicable chronic diseases(Reference Hoffmann15). Instead of examining a single factor (diet, physical activity, smoking, alcohol consumption and sleep) and its association with health/illness, this approach studies the entire lifestyle pattern and the interrelationships that may exist between these various lifestyle factors. As a result, a lifestyle pattern is distinguished as a dynamic interaction between factors, rather than emphasising each individual factor. Thus, the effects of a lifestyle pattern on cardio-metabolic health would outweigh those of its components taken individually (diet, physical activity, alcohol, smoking and sleep) and could thus detect more associations and implications in real life(Reference Al Thani, Al Thani and Al-Chetachi3).

Understanding dietary and lifestyle patterns would provide necessary evidence for planning intervention and education strategies(Reference Oguoma, Nwose and Skinner16).

Assessment of dietary intake

Of all the available subjective methods that evaluate a person's nutritional intake: 24-h recall, food record, food history and FFQ, the last has been the most widely used in epidemiological research. Nutritional data have been obtained either by a trained interviewer or through self-reporting(Reference Shim, Oh and Kim17).

FFQ is the most appropriate dietary assessment tool because it is easy to apply by the researcher. The method is actually an advanced form of food history. It has two components: a qualitative one that investigates the frequency of consumption of a food, and a quantitative one that estimates the amount of food consumed with the aid of a photographic atlas or using some culinary measures. The subjects answer on how often and how much food they have consumed in a given period of time(Reference Rodrigo, Aranceta and Salvador18). FFQ can focus on the intake of specific nutrients(Reference Gkza and Davenport19), dietary exposure to a particular group of foods only (which may be linked to a particular disease)(Reference Yu, Liu and Wang20) or on assessing the inter-correlations between nutrients and between foods (i.e. the dietary pattern) with their effects on health status/risk of disease(Reference Archundia Herrera, Subhan and Chan21,Reference Panagiotakos, Notara and Kouvari22) .

In addition to nutritional inquiry, particular biochemical markers have been used to measure the dietary intake of specific nutrients or foods(Reference Dragsted23Reference Corella and Ordovas25). Nutritional biomarkers offer objective estimates of dietary exposure in anthropometric and clinical assessment, while 24-h recall, food record, food history and FFQ are subjective estimates(Reference Shim, Oh and Kim17). However, some biomarkers may be affected by disease or physiologically, by homoeostatic regulation, so they cannot provide information on the absolute dietary intake of the subject. In addition, dietary recommendations aimed to change the eating habits of a subject cannot be made solely on the basis of biomarkers(Reference Kaaks, Ferrari and Ciampi26). Thus, direct assessment of food intake through surveys can sometimes be more informative than biomarkers(Reference Potischman27).

However, in order to obtain the most accurate estimates of food intake, it has been proposed that a combination of methods, such as FFQ with 24-h recall or FFQ with biomarkers, should be used, instead of individual method(Reference Shim, Oh and Kim17).

Dietary pattern methodology

FFQ is a reliable and inexpensive data collection method, which allows the identification and evaluation of food patterns in epidemiological studies(Reference Pachucki28). Although dietary patterns based on the 24-h recall do not most accurately assess an individual's usual eating patterns, it is also a widely accepted method for evaluating food intake at the population level(Reference Thompson, Kirkpatrick and Subar29).

Food pattern analysis has the advantage of taking into account the correlations that may exist between certain foods or groups of foods, but also between nutrients(Reference Moeller, Reedy and Millen30). It represents a broader picture of dietary intake, analysing the effects of diet as a whole. It is an alternative and supportive approach to analysing the relationship between nutrition and the risk of chronic diseases, thus being more predictive of the risk of disease compared to individual foods or individual nutrients(Reference Schulze, Martínez-González and Fung31).

Two different statistical approaches have been used in the literature for analysing dietary patterns(Reference Hu32):

  1. (1) a priori or theoretical approach which consists of defining certain quality scores or indices of the diet based on nutritional recommendations, for different categories of subjects(Reference Gil, Martinez de Victoria and Olza33,Reference Jennings, Welch and van Sluijs34) ;

  2. (2) a posteriori approach which is defined by the use of methods based on exploratory data:

Both factor analysis and cluster analysis are considered a posteriori because food models are obtained by statistical modelling of dietary data(Reference Trichopoulos and Lagiou39). One of the a posteriori approaches is to derive food patterns based on the variation in specific markers related to health/disease(Reference Ocke40,Reference Hoffmann, Zyriax and Boeing41) . However, there are some limitations, in the sense that if one cannot take into account the daily variation of dietary intake at the individual level, the statistical power in detecting the correct and real associations between the dietary patterns and certain diseases can be reduced(Reference Gibson, Charrondiere and Bell42). Because a posteriori approaches generate patterns based on available empirical data, but which do not have an a priori hypothesis, they do not necessarily represent optimal models. Conversely, the approach of the quality index also presents some limitations (present knowledge and the ability to understand the diet–disease relationship), as well as uncertainties in selecting the individual components for the composition of the score and uncertainties related to the subjectivity in defining some cutoff points(Reference Hu32).

Although these approaches are based on different methods, all of them can help identify healthy or unhealthy dietary patterns and can be the basis for developing and implementing nutritional guidelines(Reference Tapsell, Neale and Satija2).

A priori methods

These methods use nutritional variables that are quantified in such a way that they could provide an overall assessment of diet quality, thus being important for the definition of health status(Reference Waijers, Feskens and Ocké43).

A priori approaches based on scores are constructed according to certain dietary guidelines and include selected nutrients and/or foods and/or food groups, according to nutritional recommendations, thus establishing a certain score. Later, the data are grouped, referring to the predefined ones, to obtain a score (a measure of diet quality)(Reference Román-Viñas, Ribas Barba and Ngo44).

The diet quality index (DQI)(Reference Haines, Siega-Riz and Popkin45) is a score of the degree to which an individual's diet is in accordance with the specific dietary recommendations. DQI are tools that aim to assess the quality of diets and thus allow individuals to be classified based on the degree to which they have a ‘healthy’ eating behaviour(Reference Gil, Martinez de Victoria and Olza33). Individuals are scored for each component, then a score is calculated for each individual; high scores reflect dietary intake according to nutritional recommendations(Reference Wirfält, Drake and Wallström46).

Another simple and common score is the dietary diversity score, which takes into account the number of portions in the food groups (i.e. dairy, meat, cereals, fruits and vegetables) or foods consumed regularly(Reference Azadbakht and Esmaillzadeh47,Reference Nachvak, Abdollahzad and Mostafai48) .

Presently, there are a large number of DQI, most of them being designed, defined or adapted to express the nutritional needs of different population groups and to highlight the compliance to specific food patterns(Reference Kranz and McCabe49).

There are three major categories of indicators:

  1. (1) nutrient-based indicators, which need to be transformed from quantity (weight of food) to quality (nutrient content), and subsequently compared with standard requirements(Reference Gil, Martinez de Victoria and Olza33);

  2. (2) food/food group-based indicators that use food guides to assess portions, frequencies or food groups(Reference Trichopoulou, Costacou and Bamia50);

  3. (3) a combination of indicators, which refer to dietary variety within and between food groups, to adequate nutrient intake (compared to standard recommendations) or to suitable intake of food groups (quantities or portions), to the frequency of food consumption, and also to a general balance of macronutrients(Reference Kennedy, Ohls and Carlson51).

DQI use a scoring system, which can establish adherence to a dietary model defined a priori and can thus be used to measure the quality of diets within a population. The best example is the healthy eating index. This is a DQI, created and validated in 1995 by the US Department of Agriculture, to reflect the nutritional recommendations in the Dietary Guidelines for Americans(Reference Kennedy, Ohls and Carlson51).

The analysis of the updated healthy eating index-2015 captures the variation of diet quality in a way that takes into account the multivariate nature of healthy diets. This method of evaluation, the updated index, captures some elements of real interest: high-quality diets have high scores, scores vary within the population, diet quality varies between different groups of people, diet quality is evaluated independently of quantity, diet quality is multidimensional, distinct dietary components can be captured, and not least, it is associated with a reduced risk of general mortality and morbidity, showing the validity of the criterion(Reference Reedy, Lerman and Krebs-Smith52).

The main advantage of the a priori method is its generalisation (it can be applied to several populations)(Reference Román-Viñas, Ribas Barba and Ngo44). Each DQI has different food and nutrient components, as well as different approaches to score, which makes comparability limited. Moreover, most DQI have been developed only for certain specific populations and cannot be widely used in others. Also, it is difficult to compare the results between studies using different DQI(Reference Olza, Martínez de Victoria and Aranceta-Bartrina53). The subjectivity of the investigator responsible for the definition of indices, and the fact that they are based on nutritional recommendations, which have been defined for certain populations, thus not making them possible to be applicable to others(Reference Román-Viñas, Ribas Barba and Ngo44), could be major disadvantages when analysing data.

A posteriori methods

The study of nutritional patterns using data extraction methods, based on correlations between food groups, has been proposed in nutritional epidemiology by most researchers(Reference Einsele, Sadeghi, Ingold and Jenzer8). For this purpose the statistical techniques used are: factor analysis, cluster analysis and low rank regression(Reference Román-Viñas, Ribas Barba and Ngo44).

Factor analysis (principal component analysis) is a multivariate statistical technique, which uses information obtained from FFQ to identify food consumption factors (or patterns)(Reference Trichopoulos and Lagiou39). It aggregates and reduces the dietary data to a correlation between foods, which would explain the greatest variation in the diet of the studied group(Reference Martinez, Marshall and Sechrest54). A score is obtained for each model (factor and dietary pattern), which can be used subsequently, by statistical methods of correlation or regression, to examine relationships, such as, for example, nutrient intake, in association with cardiovascular risk factors and other biochemical indicators of health(Reference Trichopoulos and Lagiou39). The use of factor analysis to identify food patterns may have limitations. The results of factor analysis can be affected by subjective, but important, decisions that need to be taken in defining the food pattern: the allocation of food in food groups, which variables to be included in the analysis to build the patterns, which variables can contribute to the definition of a factor, the number of extraction factors, the rotation method and even the labelling of factors (the name of the pattern). Such decisions can lead to erroneous conclusions(Reference Román-Viñas, Ribas Barba and Ngo44). However, this method offers the opportunity to summarise and refines the data to a simpler descriptive model(Reference Paradis, Pérusse and Vohl55).

Principal component analysis has a long-term reproducibility, stability and validity compared to other methods(Reference Tucker56) that could minimise the risk of errors. Unlike cluster analysis that involves empirical classification, principal component analysis theoretically establishes a causal relationship between indicators (items). It does not describe the natural patterns of the population in the study, but explains the important variation within the population(Reference Tucker56).

However, exploratory analysis is used when there is an a priori hypothesis about the factor structure. As such, its advantage is that it reduces some of the subjectivity associated with the exploration procedure and can be applied in different population samples(Reference Román-Viñas, Ribas Barba and Ngo44).

Using factor analysis, most researchers identified two major patterns. The first pattern, labelled ‘prudent’, is in general characterised by a higher intake of vegetables, fruit, legumes, whole grains and fish, while the second pattern, labelled ‘western’, is characterised by a higher contribution of processed meat, red meat, butter, high fat dairy products, eggs and refined grains. The main patterns identified by factor analyses are in accordance with the a priori knowledge(Reference Hu32). Another common pattern identified in European studies is the Mediterranean one, characterised by increased intake of vegetables, fruit, fish and olive oil(Reference Panagiotakos, Notara and Kouvari22). Moreover, this statistical methodology has been extended to other regions of the world, making it possible to identify another pattern, the traditional one. For example, the traditional Japanese pattern(Reference Niu, Momma and Kobayashi57), characterised by consumption of vegetables, seafood, soya, fish, fruit, green tea, miso soup; or the traditional Brazilian pattern(Reference Drehmer, Odegaard and Schmidt58), characterised by the consumption of white rice, grains, beer, fresh and processed meat.

Cluster analysis is another multivariate statistical method that allows the characterisation of food patterns. Unlike factor analysis, cluster analysis aggregates individuals into relatively homogeneous subgroups that have similar diets. Individuals can be classified into separate groups or similar groups based on the frequency of food consumed, the percentage of energy contributed by each food or food group, the average amount of food intake (g), nutrient intake or a combination of dietary and biochemical measures(Reference Trichopoulos and Lagiou39). A certain amount of subjectivity is also included in this method: the choice of variables to be included in the analysis and the number of factors to be included or at what level of significance to apply the variables(Reference Román-Viñas, Ribas Barba and Ngo44).

The RRR (reduced rank regression) statistical method combines two sources of information (preliminary data and study data). RRR reduces the size of predictor variables (e.g. food intake or specific food groups) to the size of response variables (e.g. nutrients as biomarkers)(Reference Hoffmann, Schulze and Schienkiewitz59). RRR analysis produces a linear combination of food groups that explains the maximum variation of response variables(Reference van Dam60). RRR identifies linear functions of predictors that explain as many response variations as possible(Reference Hoffman, Schulze and Boeing61). As with other a posteriori approaches, it is difficult to assess whether the food model can be applied to different groups of populations, and to compare the results later(Reference van Dam60).

The results obtained by either of these methods indicate which food/beverage combination best predicts the health/disease condition. However, this approach itself does not take into account other non-dietary variables and thus cannot provide information on whether these associations between dietary pattern and health/disease persist after adjusting for socio-demographic or other lifestyle factors(Reference Voortman, Leermakers and Franco37).

Other lifestyle components in relation to dietary patterns

From an epidemiological point of view, diet is a complex combination of exposures. However, experimental epidemiological studies often fail to certify the effects observed for all dietary components. The conventional approach adopted in food consumption investigations is focused on assessing the intake of energy, nutrients or foods as independent variables, and this does not take into account the effect of the diet as a whole on risk diseases, and confusions and interactions that may occur between different dietary components are not properly considered(Reference Cunha, Sichieri and de Almeida62,Reference Jacques and Tucker63) .

Dietary patterns are supposed to illustrate the real situation of dietary availability and dietary practices of the studied population(Reference Perozzo, Olinto and Dias-da-Costa64). As a result, they facilitate the identification of subgroups that adopt dietary habits that are compatible with risk or protection against chronic diseases and provide credible scientific support for developing dietary guidelines(Reference Cai, Zheng and Xiang65).

Diet is a major modifiable determinant of most chronic diseases. It is known that dietary choices are strongly influenced by socio-demographic determinants and other lifestyle factors. Therefore, identifying the determinants of food consumption is essential for examining their possible contribution to the prevalence of the disease(Reference Krieger, Pestoni and Cabaset66).

Indeed, several individual factors have been shown to be associated with food patterns(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9). Both healthy and unhealthy dietary patterns may vary according to sex, socio-economic status, ethnicity, culture and other factors(Reference Hu32,Reference Fransen, Boer and Beulens67) , but moreover, they may vary depending on different associations between these factors. In recent years, researchers have tended to group lifestyle factors. These risk factors are not arbitrarily spread in the population, but they appear in combination with other lifestyle risk factors. The grouping of the risk factors of the lifestyle is related to a higher degree of association with different diseases than we would expect from each of the individual risk factors. Because lifestyle groups in a community can be associated with different patterns of demographic and social risk factors(Reference Noble, Paul and Turner68), identifying different lifestyle patterns and associated factors across the country may be helpful in finding high risk subgroups, which require appropriate interventions(Reference Akbarpour, Khalili and Zeraati69). For example, age and education are positively associated with a healthy diet (characterised mainly by high intake of fruit, vegetables or fish)(Reference Kesse-Guyot, Bertrais and Péneau70). In addition, the connection between physical inactivity, smoking and young age was associated with an unhealthy diet(Reference Patino-Alonso, Recio-Rodriguez and Belio71). Healthy diet (and its major healthy dietary components), moderate alcohol consumption, non-smoking status, normal weight and regular physical activity have been associated with a lower risk of premature mortality and a longer life expectancy(Reference Li, Pan and Wang72). Moreover, there is much evidence that stresses the role of nutrition, in relation to that of physical activity and sleep, on health and mortality(Reference Schwingshackl, Schwedhelm and Hoffmann73,Reference Xiao, Keadle and Hollenbeck74) .

The health consequences of adopting unhealthy lifestyle habits cannot be overestimated and, therefore, specific policy strategies or an appropriate action plan are needed to reduce adhering to an unhealthy diet and/or promote healthy diets, to reduce physical inactivity and/or promote physical activity or to reduce the increased consumption of alcohol and tobacco(Reference Oguoma, Nwose and Skinner16). Given the potential for synergistic relationships between diet, physical activity, sleep, concomitant improvement of multiple lifestyle behaviours may have the potential to deliver greater health benefits compared to single behavioural improvement(Reference Oftedal, Vandelanotte and Duncan75). Thus, identifying groups with healthier eating patterns would allow better nutritional strategies in terms of population nutrition(Reference Tucker56).

Sex

In the literature, it is commonly found that women generally have higher scores for the pattern considered healthy and lower scores for the pattern considered unhealthy(Reference Knudsen, Matthiessen and Biltoft-Jensen76), while men are usually associated with unhealthier patterns (Western, Western-like or others, which are characterised by high fat, meat or fast-food intake)(Reference Arruda, da Silva and Kac77,Reference Schneider, Huy and Schuessler78) .

Age

Several socio-demographic characteristics and family lifestyle were related to the child's eating patterns(Reference Kiefte-de Jong, de Vries and Bleeker79) and the nutritional status of the child(Reference Heppe, Kiefte-de Jong and Durmus80). These factors are thus important to consider when studying the relationship between diet and weight status.

During childhood and adolescence, the evaluation and monitoring of food intake and other health behaviours is particularly important(Reference Lobo, de Assis and Leal81), as these are decisive steps in forming eating habits and maintaining them into adulthood(Reference Craigie, Lake and Kelly82). In recent years, due to the increased prevalence of overweight worldwide, the need to monitor eating habits among young people has increased(Reference Lobstein, Jackson-Leach and Moodie83). One method that helps nutritional assessment in children/adolescents is the development of particular online nutritional surveillance systems, designed to collect periodic information on weight status (based on BMI), food consumption, hours of physical activity or sedentary behaviour, food consumption at school meals. Such data allow the following of anthropometric parameters, food patterns and other healthy/unhealthy behaviours, as well as their association with weight status(Reference Lobo, de Assis and Leal81,Reference Costa, Schmoelz and Davies84) .

Changes in daily patterns, such as daily school hours or the weekends, clearly and significantly contribute to changes in food intake, to a pattern of physical activity, and ultimately to energy balance(Reference McCarthy85). In children, a so-called ‘traditional’ pattern was identified, characterised by a consumption of certain foods reported on school days, i.e. on weekdays (different from food consumption on non-school days, weekends or holidays). Food quality was found to be lower at the end of the week compared to the weekdays, with a significantly higher intake of total sugars(Reference Svensson, Larsson and Eiben86), sweetened beverages, confectionery, pastry, snacks and at the same time, with lower consumption of fruit and vegetables(Reference Rothausen, Matthiessen and Andersen87). Therefore, school meals seem to play a particularly important role in promoting healthy eating, by creating opportunities and benefits for expanding the diversity of food groups and establishing a benchmark for healthy eating(Reference Lobo, de Assis and Leal81).

Exploratory data-based methodologies to examine the interrelationships between eating patterns, physical activity and sedentary behaviours in children and adolescents have shown that healthy and unhealthy patterns are grouped in a variety of ways that are both beneficial and harmful to health(Reference Leech, McNaughton and Timperio88). Thus, one can talk about the ‘mixed’ eating pattern, which is characterised by the presence of both healthy and unhealthy foods(Reference Lobo, de Assis and Leal81).

A multitude of internal and external factors can influence adolescents' eating patterns. Internal factors include: self-image, physiological needs, individual health, values, preferences and psychosocial development. And among the external factors, there are mentioned: family habits, friendships, social and cultural values and rules, the media, individual tendencies, personal experience and knowledge(Reference Dayana, Reshma and Dhanalekshmy89).

The nutritional status of adolescents is the result of interrelated factors, influenced by the quality and quantity of food consumed and by the physical health of the individual and has important implications for their health, thereby playing a key role in the development/prevention of several chronic diseases. During adolescence, changes in an individual's lifestyle may affect eating habits and choices, but there are also physical changes that affect the nutritional needs of the body(Reference Omage and Omuemu90).

One of the most common patterns among adolescents includes: snacks (usually high-energy foods), lack of a main meal (especially breakfast) or irregular meals, the predominance of fast-foods, with reduced consumption of fruit and vegetables(Reference Omage and Omuemu90). Thus, unhealthy eating patterns among young people could promote the prevalence of obesity and cardiovascular risk factors in this population group(Reference Marques-Vidal, Bovet and Paccaud91). It is evident from epidemiological research that the pattern characterised by intake of meat and French fries has been associated with an increase in the prevalence of diabetes(Reference Fung, Schulze and Manson92) and acute myocardial infarction, while a pattern characterised by fruit and vegetables has been proven to be protective(Reference Oliveira, Rodríguez-Artalejo and Gaio93).

Regarding older subjects, the literature found that they usually have a higher adherence to the fruit and vegetable patterns and are more likely to consume foods included in the healthy eating index(Reference Reininger, Lee and Jennings94) and a lower adherence to the meat and French fries pattern(Reference Knudsen, Matthiessen and Biltoft-Jensen76). However, also among the elderly, there was also a high score for the pattern with high fat and sugar intake. This could be due to several factors, including hypogeusia(Reference Imoscopi, Inelmen and Sergi95) or a decrease in financial capacity (which forces older people to buy less expensive, sweeter or high-fat foods)(Reference Drewnowski96). Important components of the ageing process are included in the healthy eating pattern, as they contain nutrients that protect against systemic inflammation and endothelial dysfunction(Reference Lopez-Garcia, Schulze and Fung97). Adopting this pattern would delay the onset of age-related diseases(Reference Everitt, Hilmer and Brand-Miller98). The association between a healthy eating pattern and adherence to at least two other factors of a healthy lifestyle has been shown to be correlated with decreased mortality in the elderly(Reference Zhao, Ukawa and Okada99).

Socio-economic determinants

Several variables (such as education, income, type of employment and some characteristics of the particular areas in which populations live) that characterise the socio-economic status of different populations around the world are closely linked to diet quality. However, there is no unanimity on how education or income levels affect diet quality(Reference Olza, Martínez de Victoria and Aranceta-Bartrina53).

Very complex interactions between education, income level and occupation are identified. A low level of education, a low income or a low professional position were associated with an unhealthy dietary pattern(Reference Kant7) and with low quality diet, characterised by lower fibre, mineral and vitamin intake(Reference Hassen W, Castetbon and Cardon100), while a higher educational level or higher professional position were associated with a healthy dietary pattern(Reference Boylan, Lallukka and Lahelma101).

Although not generally valid, in most cases the urban environment is associated with healthy eating patterns, which include greater dietary diversity and yet with a food intake of animal origin. In contrast, rural dwellers from low-income countries, and even some middle-income countries, still rely on unhealthy food preservation methods (e.g. salting or smoking)(Reference Mayen, Marques-Vidal and Paccaud102).

The relationships between diet quality and socioeconomic status internally are important to evaluate, as diet quality can be influenced by other factors (target population, unemployment, occupation of different family members, access to food, urbanisation in countries with small or large gross domestic products)(Reference Lutomski, van den Broeck and Harrington103). Unhealthy behaviours tend to be present, especially in people with low socio-economic status(Reference Fransen, Boer and Beulens67).

Highly educated participants had higher scores for fruit and vegetables and lower scores for fried meat and potatoes and to a lesser extent for fat and sugar models, a finding repeatedly reported in the literature(Reference Knudsen, Matthiessen and Biltoft-Jensen76). One likely explanation is that the dietary intake of highly educated persons is in line with dietary recommendations(Reference de Abreu, Guessous and Vaucher104). These people tend to have higher incomes that allow them to buy more fruit and vegetables than less educated people(Reference Drewnowski96).

Lower education has been associated with unhealthy eating patterns. Cheaper, unhealthier, high-risk foods for chronic diseases have been found more often especially among low-educated women(Reference Lenz, Olinto and Dias-da-Costa105).

Students

The Western lifestyle has led to changes in eating habits among young students in developing countries. The populations of university students are characterised by physical inactivity, sedentary behaviours and unhealthy dietary behaviours, i.e. irregular meals, inadequate snacks, high consumption of fast food and insufficient consumption of fruit and vegetables(Reference Peltzer and Pengpid106). To enable them to cope with the energy needs of the body, as they carry out their normal academic activities(Reference Omage and Omuemu90), most students consume frequent snacks outside the main meals. Low levels of physical activity and unhealthy eating patterns are not compatible with national recommendations for a healthy active lifestyle for young people and may contribute to increasing the rate of overweight and obesity in this population(Reference Monteiro, Varela and Bade107), and therefore individuals are more prone to developing type-2 diabetes mellitus and CVD(Reference Khabaz, Bakarman and Baig108,Reference Amuna and Zotor109) .

Smoking

There is extensive information on the relationship between nutrient intake and smoking; smoking is associated with less healthy eating behaviour, regardless of culture, ethnicity or region(Reference Suh, Lee and Park110). Smoking is associated with both reduced antioxidant intake and increased turnover of these micronutrients(Reference Northrop-Clewes and Thurnham111). Smokers usually have lower scores for the prudent model(Reference Northstone and Emmett112). Present smoking selectively affects the consumption of specific foods. Possible explanations include non-adherence to dietary recommendations(Reference de Abreu, Guessous and Vaucher104), as well as tobacco-induced changes in the sensory system, taste impairment(Reference Yamauchi, Endo and Yoshimura113) and decreased olfactory capacity(Reference Vennemann, Hummel and Berger114), causing smokers to select foods with stronger/saltier/unhealthier flavours(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9).

Compared to non-smokers, smokers are more likely to adopt an unhealthy dietary pattern if they have a low educational level, but a lower probability of such pattern if they have a high educational level(Reference Fransen, Boer and Beulens67). A low level of education, in combination with physical inactivity and smoking were linked also to a lower adherence to a Mediterranean-style diet(Reference Hu, Toledo and Diez-Espino115).

Alcohol

Moderate alcohol intake is an important component of the Mediterranean pattern(Reference Hernandez-Hernandez, Gea and Ruiz-Canela116), which has been shown to be a protective factor against cardiovascular mortality, myocardial infarction or stroke(Reference Estruch, Ros and Salas-Salvadó117). Those who consume wine in moderation usually have healthier lifestyles than other types of alcohol consumers, smoke less and take more physical activity, with increased fruit and vegetable consumption and reduced red meat and fried foods(Reference Barefoot, Grønbaek and Feaganes118).

Increased alcohol consumption has been associated with the risk of hypertension(Reference Oguoma, Nwose and Skinner16) and stroke(Reference Reynolds, Lewis and Nolen119). Those who consume alcohol in high amounts tend to have associated unhealthy behaviours, such as poor quality diets, low physical activity and a general tendency for reckless actions that lead to an increased risk of mortality(Reference Laatikainen, Manninen and Poikolainen120).

Previous dieting

The literature reports that those who have followed different diets over time have higher scores for the prudent model and lower scores for models characterised by meat, fries, fats and sugar, possibly due to increased awareness of the importance of food intake(Reference Berg, Lappas and Strandhagen121). Due to the large variation in the type of diet, it is not possible to accurately assess the associations between each type of previous diet and the presently different dietary patterns(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9).

Sedentariness

Sedentary lifestyle is associated with a low adherence to the fruit/vegetable pattern and has the tendency to be associated with a higher score for the unhealthy pattern (animal fats and sweets). Such findings have been repeatedly reported in the literature(Reference Northstone and Emmett112). Food patterns are closely linked to several lifestyle features(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9), which relate to sedentary behaviours, including watching TV. These behaviours were related to high consumption of sweetened beverages, ready-made products, sweet foods, snacks, fast food and alcohol(Reference Charreire, Kesse-Guyot and Bertrais122).

Obesity

People with obesity may underestimate the intake of foods they consider to cause obesity. In general, increased BMI is associated with unhealthy dietary patterns(Reference Marques-Vidal, Waeber, Vollenweider and Guessous9). The anthropometric parameters are related to the model ‘fats and sugar, meat and fries’. This association may be due to the fact that most people do not consider meat as obesogenic(Reference Mesas, Leon-Munoz and Guallar-Castillon123). In addition, a better BMI is associated with the ‘fruit and vegetables’ pattern(Reference Esmaillzadeh and Azadbakht124). Thus, frequent consumption of fruit and vegetables, while respecting restrictions on the amount of food consumed and at least moderate physical activity during leisure, are associated with a lower probability of overweight/obesity(Reference Jezewska-Zychowicz, Gębski and Plichta125).

Sleep

Sleep disorders, including short sleep duration, are recognised as a risk factor for the negative outcomes of an unhealthy lifestyle(Reference Iftikhar, Donley and Mindel126). Sleep is a key modulator of metabolic functioning, including energy metabolism, glucose regulation and appetite(Reference Koren, O'Sullivan and Mokhlesi127); research conducted in recent years has focused on the effects of sleep duration and dietary intake, especially as sleep may present a modifiable risk factor for chronic non-communicable diseases, such as obesity(Reference Pot128). Short sleep duration is associated with a lower variety of foods and thus a lower intake of protein, carbohydrates, fibre and fat compared to normal sleep duration(Reference Grandner, Jackson and Gerstner129). In particular, total serum carotenoid concentrations were associated with a higher probability of short sleep duration (5–6 h per night) compared to normal sleep duration (7–8 h per night)(Reference Beydoun, Gamaldo and Canas130).

The relationship between sleep and diet quality is bidirectional(Reference Mondin, Stuart and Williams131). Sleep has an impact on diet, but conversely, diet/specific foods/dietary patterns have an impact on sleep(Reference Pot128). Short sleep duration is associated with weight gain through effects on appetite, physical activity and/or thermoregulation(Reference Marshall, Glozier and Grunstein132). An inverse association between sleep duration and BMI is described, however, long sleep on weekdays was associated with a lower score of healthy eating pattern compared to normal sleep duration(Reference Almoosawi, Palla and Walshe133). Another important consideration is not only the types of foods, but also regular meals, as well as the last meal at which these foods are consumed, which may be important for sleep(Reference Mondin, Stuart and Williams131).

Transitions

The literature shows that dietary habits change over time (in the same individual or at the population level), and this helps us understand how changes in eating pattern are reflected in the health status(Reference Pachucki28). Diet and dietary pattern can undergo drastic changes during transitional periods: from a single person to a married person, or during certain significant events in the marital sphere (i.e. death and divorce), which have been shown to have repercussions on food consumption(Reference Koball, Moiduddin and Henderson134). Thus, further research should focus on and address changes in dietary patterns throughout life (with a greater focus on important life transitions).

Population movement within the same countries, from rural to urban areas, may also be related to these changes in diets, frequently to some healthier models(Reference Bowen, Ebrahim and De Stavola135). The linguistic region of a country is another major determinant of patterns, which have a particular distribution among the linguistic regions, apparently reflecting the cultural influence of the respective neighbouring countries on the food patterns(Reference Krieger, Pestoni and Cabaset66).

When it comes to relationships, women in a couple are more likely to adhere to a healthy eating pattern, compared to single women, who are less likely to follow dietary recommendations(Reference Malon, Deschamps and Salanave136).

During pregnancy, dietary composition can play an important role in pregnancy and fetal weight(Reference Tielemans, Erler and Leermakers137). During pregnancy it is essential that the dietary pattern be prudent, which provides the energetic and nutritional intake necessary for maternal health, so as to contribute to the prevention of pregnancy-related diseases and to allow for fetal growth and development under favourable conditions. The nutritional status of the mother during the preconception and/or during pregnancy may affect the perinatal phase of the pregnancy outcome(Reference Keen, Clegg and Hanna138). Higher weekly weight gain is linked to greater adherence to a dietary pattern characterised by high intake of sweets, fast foods and snacks, while a pattern characterised by increased intake of vegetables, fruit and fish was not associated with gestational weight gain(Reference Uusitalo, Arkkola and Ovaskainen139). Also, it was observed that the patterns do not change significantly over time. Therefore, a correct assessment of the food intake obtained at any given time during pregnancy can provide basic information about the dietary pattern throughout the pregnancy(Reference Cuco, Fernandez-Ballart and Sala140).

Breakfast

There is scientific evidence to suggest that the pattern of a meal is an important determinant of diet quality, energy consumption and nutrient content and, thus, cardio-metabolic health(Reference Leech, Worsley and Timperio141,Reference Leech, Worsley and Timperio142) . For example, skipping breakfast is associated with poor diet quality(Reference Min, Noh and Kang143) and thus with adverse cardio-metabolic health outcome(Reference Mekary, Giovannucci and Cahill144). The nutritional composition of breakfast should also be taken into account when this meal is present(Reference Chatelan, Castetbon and Pasquier145), as is the pattern of the other meals throughout the day(Reference Leech, Worsley and Timperio142).

In adults it has been shown that daily breakfast intake improves the intake of nutrients, the selection of food groups and therefore the quality of diet(Reference Min, Noh and Kang143,Reference Deshmukh-Taskar, Radcliffe and Liu146) . In general, breakfast consumption is associated with improved adiposity parameters(Reference O'Neil, Nicklas and Fulgoni147), decreased cardiovascular risk factors(Reference Odegaard, Jacobs and Steffen148) or decreased risk of adverse effects related to glucose and insulin metabolism. Breakfast can contribute to a healthier diet, which can also lead to cardio-metabolic improvements(Reference St Onge, Ard and Baskin149). Breakfast skipping is a very common practice among students and, despite this fact, and even if the consumption of certain food groups is avoided, the proportion of young people with overweight and obesity tends to increase(Reference Juan, He and Zhiyue150).

Late meal in the evening/at night

Several cross-sectional studies have shown an association between late night food intake, in combination with skipped breakfast, and a higher risk of adverse health effects(Reference St Onge, Ard and Baskin149), including metabolic syndrome(Reference Kutsuma, Nakajima and Suwa151).

This particular form of the late-meal pattern is present more frequently in young adults and students(Reference Jun, Choi and Bae152,Reference Striegel-Moore, Franko and Thompson153) and refers to the chronological type, i.e. the individual preferences for sleep time and eating behaviour; morning or evening type(Reference Lucassen, Zhao and Rother154). In terms of eating behaviour, studies show that evening types associate less healthy eating habits (main meal later in the day both on work- and non-working days, a tendency towards fewer meals daily, with larger portions, higher energetic intake and inadequate vitamins and minerals) and have a higher BMI(Reference Lucassen, Zhao and Rother154,Reference Sato-Mito, Shibata and Sasaki155) . Night time eating, in particular, has been identified as a risk factor for metabolic syndrome and obesity(Reference Baron, Reid and Kern156,Reference Berg, Lappas and Wolk157) .

The late evening meal was found to be associated with sleep apnoea, with lower levels of HDL-cholesterol and higher levels of stress hormones(Reference Lucassen, Zhao and Rother154). Night meals are also associated with a higher risk of obesity(Reference Harb, Levandovski and Oliveira158).

Occasional/out-of-home meals

Neutral terms ‘occasionally eaten’ or ‘eaten at an event’ or ‘outside the home’ are used to describe any occasion where food or drink is consumed and therefore includes all types of foods. Meals are described taking into account: modelling (e.g. frequency, regularity, irregularity, spacing and timing), format (e.g. different food combinations and nutritional content) and context (e.g. eating together with others or with the family, eating meals in front of the television or outside the house)(Reference Leech, Worsley and Timperio142).

Regarding sex, it is known that men consume more meals that are not prepared at home than women(Reference Oguoma, Nwose and Skinner16). Meals prepared outside the house, especially fast foods, contain high levels of energy and a low amount of nutritional compounds(Reference Lachat, Nago and Verstraeten159). Therefore, the frequency of food consumption in restaurants is positively associated with the increase in body fat in adults. In general, people with obesity choose a larger quantity of food in the restaurant than the normal-weight people(Reference Nicklas, Baranowski and Cullen160). Conversely, frequent consumption of home-cooked meals is associated with a lower risk of developing cardio-metabolic disease, such as diabetes(Reference Zong, Eisenberg and Hu161) or obesity(Reference Wolfson and Bleich162).

Conclusions

The complex interconnections between nutrients, foods and dietary patterns imply that no individual component of the diet can provide a complete picture of the favourable/unfavourable effects of diet on health, thus a methodical approach using evidence-based on dietary patterns is warranted.

It is clear that lifestyle, of which an important component is the diet, is of great importance for health. The dietary pattern exerts its effects on health in a synergistic way or even in conjunction with other lifestyle environmental factors, and we can therefore acknowledge the role of a ‘healthy lifestyle pattern’.

Financial Support

This research received no specific grant from any funding agency, commercial or not-for-profit sectors.

Conflict of Interest

None.

Authorship

The authors had joint responsibility for all aspects of preparation of the present paper.

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