The commentary in this journal reporting on the inclusion of public health nutrition in medical education in the UK⁽ Reference Broad and Wallace ^{1 )} is an important reminder of the great need for such measures. The adequacy of nutrition education of medical doctors has long been a concern not only in the UK⁽ Reference Davis ^{2 )} and the rest of Europe⁽ Reference Adams, Kohlmeier and Zeisel ^{3 )}, but also in the USA⁽ Reference Leslie and Thomas ^{4 ,} Reference Chung, van Buul and Wilms ^{5 )} as well as low- and middle-income countries such as those in Africa for example⁽ Reference Sodjinou, Bosu and Fanou ^{6 )}. However, it is also increasingly recognized that all health-care professions need basic nutrition training, not just medical doctors⁽ Reference DiMaria-Ghalili, Mirtallo and Tobin ^{7 )}. This training should not just be about basic nutrition science, but also on how to assess dietary intake and provide appropriate nutritional guidance, counselling and nutrition education, and treatment to patients. Furthermore, a recommended strategy to move forward the integration of nutrition education into the training of health professionals is the use of an interprofessional approach, which will promote teamwork for learning and patient care⁽ Reference Kushner, Van Horn and Rock ^{8 )}.

Fortunately, the number of initiatives aimed at trying to increase and improve the nutrition competencies of medical professionals is growing in higher-income countries⁽ Reference Kris-Etherton, Akabas and Douglas ^{9 )}. In the UK, for example, the Need for Nutrition Education/Innovation Programme has pursued a phased approach to the generation of evidence that improved medical nutrition is needed and can have an impact⁽ Reference Ray, Udumyan and Rajput-Ray ^{10 –} Reference Ball, Crowley and Laur ^{12 )}. In the USA, core nutrition competencies have been proposed for medical students and are continuously updated⁽ Reference Kushner, Van Horn and Rock ^{8 )}. In Italy, the Federation of Nutrition Societies has identified three main domains of human nutrition, namely basic nutrition, applied nutrition and clinical nutrition⁽ Reference Donini, Leonardi and Rondanelli ^{13 )}. Thirty-two items attributed to one or more of the three domains have been ranked, considering their diverse importance for academic training in the different domains of human nutrition. The hope is that a better integration of the professionals involved in the field of human nutrition will eventually occur based on the progressive consolidation of knowledge, competence and skills in the different areas and domains of this discipline. For this to happen there is a growing recognition that dietitians and nutrition professionals must assume a leadership role in medical education training for health-care professionals⁽ Reference Kris-Etherton, Akabas and Bales ^{14 )}.

The ideal structure and organization of the nutrition workforce across the various sectors and levels of government is still not widely acknowledged, however. It has been proposed that the nutrition workforce is best portrayed as a pyramid⁽ Reference Shrimpton, du Plessis and Delisle ^{15 )}, with the base consisting of community health, nutrition and extension workers who deliver nutrition services directly to populations (e.g. child growth monitoring and promotion). The middle levels are the medical doctors, nurses and midwives who deal directly with patients through health services, as well as the extension workers who deliver interventions through the agriculture and education sectors for example. A specialist public health nutrition professional is required as the manager in each health administrative area, overseeing the work of other health staff and related staff from other sectors. Perhaps the greatest challenge for the public health nutrition specialist is providing guidance to the many health professionals at the periphery of health services to deliver nutrition-specific and sensitive interventions and specially to enable them to build capacity at the community level. The upper levels of the pyramid are nutritionists and dietitians with different levels of university training for overseeing and carrying out various roles: from implementation of programmes and nutrition counselling at individual and community level, through programming and coordination, up to planning, advocacy and research at national level.

Others have pointed out the shortage in quantity, quality and geographic coverage of the nutrition workforce⁽ Reference Fanzo, Grazioze and Kraemer ^{16 )}. More investments are certainly needed to increase the number of dietitians and nutritionists worldwide and especially in low- and middle-income countries⁽ Reference Ellahi, Annan and Sarkar ^{17 )}. Yet, although this tier of the nutrition workforce are the ones who should be leading nutrition programmes in various contexts, given their limited number, capacity development of personnel of other health sectors (e.g. nurses, medical doctors, front-line workers) at all levels is needed to improve maternal, infant and young child nutrition^{( 18 )}, as well as for the prevention and management of diet-related chronic disease in the whole population. The complexity of nutrition as a discipline and practice tends to be overlooked though, which underlines the need to have a specific preparation and guidance to be delivered to doctors, nurses and community health workers⁽ Reference Delisle, Shrimpton and Blaney ^{19 )}.