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The long-term health of vegetarians and vegans

  • Paul N. Appleby (a1) and Timothy J. Key (a1)

Vegetarians, who do not eat any meat, poultry or fish, constitute a significant minority of the world's population. Lacto-ovo-vegetarians consume dairy products and/or eggs, whereas vegans do not eat any foods derived wholly or partly from animals. Concerns over the health, environmental and economic consequences of a diet rich in meat and other animal products have focussed attention on those who exclude some or all of these foods from their diet. There has been extensive research into the nutritional adequacy of vegetarian diets, but less is known about the long-term health of vegetarians and vegans. We summarise the main findings from large cross-sectional and prospective cohort studies in western countries with a high proportion of vegetarian participants. Vegetarians have a lower prevalence of overweight and obesity and a lower risk of IHD compared with non-vegetarians from a similar background, whereas the data are equivocal for stroke. For cancer, there is some evidence that the risk for all cancer sites combined is slightly lower in vegetarians than in non-vegetarians, but findings for individual cancer sites are inconclusive. Vegetarians have also been found to have lower risks for diabetes, diverticular disease and eye cataract. Overall mortality is similar for vegetarians and comparable non-vegetarians, but vegetarian groups compare favourably with the general population. The long-term health of vegetarians appears to be generally good, and for some diseases and medical conditions it may be better than that of comparable omnivores. Much more research is needed, particularly on the long-term health of vegans.

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* Corresponding author: Paul N. Appleby, fax +44 (0)1865 289610; email
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1. S Agrawal , CJ Millett , PK Dhillon (2014) Type of vegetarian diet, obesity and diabetes in adult Indian population. Nutr J 13, 89.

4. LT Le & J Sabaté (2014) Beyond meatless, the health effects of vegan diets: findings from the Adventist cohorts. Nutrients 6, 21312147.

7. R Pawlak , SE Lester & T Babatunde (2014) The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12: a review of literature. Eur J Clin Nutr 68, 541548.

8. KL Tucker (2014) Vegetarian diets and bone status. Am J Clin Nutr 100, Suppl., 329S335S.

12. WL Beeson , PK Mills , RL Phillips (1989) Chronic disease among Seventh-day Adventists, a low-risk group. Rationale, methodology, and description of the population. Cancer 64, 570581.

13. TL Butler , GE Fraser , WL Beeson (2008) Cohort profile: The Adventist Health Study-2 (AHS-2). Int J Epidemiol 37, 260265.

17. GK Davey , EA Spencer , PN Appleby (2003) EPIC-Oxford: lifestyle characteristics and nutrient intakes in a cohort of 33 883 meat-eaters and 31 546 non meat-eaters in the UK. Public Health Nutr 6, 259269.

21. S Tonstad , T Butler , R Yan (2009) Type of vegetarian diet, body weight, and prevalence of type 2 diabetes. Diabetes Care 32, 791796.

22. T Key & G Davey (1996) Prevalence of obesity is low in people who do not eat meat. BMJ 313, 816817.

24. M Rosell , P Appleby , E Spencer (2006) Weight gain over 5 years in 21 966 meat-eating, fish-eating, vegetarian, and vegan men and women in EPIC-Oxford. Int J Obes (Lond) . 30, 13891396.

25. C Japas , S Knutsen , S Dehom (2014) Body mass index gain between ages 20 and 40 years and lifestyle characteristics of men at ages 40–60 years: the Adventist Health Study-2. Obes Res Clin Pract 8, e549e557.

26. GM Turner-McGrievy , ND Barnard & AR Scialli (2007) A two-year randomized weight loss trial comparing a vegan diet to a more moderate low-fat diet. Obesity (Silver Spring). 15, 22762281.

27. B Farmer , BT Larson , VL Fulgoni (2011) A vegetarian dietary pattern as a nutrient-dense approach to weight management: an analysis of the national health and nutrition examination survey 1999–2004. J Am Diet Assoc 111, 819827.

28. S Mishra , J Xu , U Agarwal (2013) A multicenter randomized controlled trial of a plant-based nutrition program to reduce body weight and cardiovascular risk in the corporate setting: the GEICO study. Eur J Clin Nutr 67, 718724.

29. S Tonstad , K Stewart , K Oda (2013) Vegetarian diets and incidence of diabetes in the Adventist Health Study-2. Nutr Metab Cardiovasc Dis 23, 292299.

30. ND Barnard , HI Katcher , DJA Jenkins (2009) Vegetarian and vegan diets in type 2 diabetes management. Nutr Rev 67, 255263.

32. K Shridhar , PK Dhillon , L Bowen (2014) The association between a vegetarian diet and cardiovascular disease (CVD) risk factors in India: the Indian Migration Study. PLoS ONE 9, e110586.

33. M Thorogood , R Carter , L Benfield (1987) Plasma lipids and lipoprotein cholesterol concentrations in people with different diets in Britain. Br Med J (Clin Res Ed) 295, 351353.

34. KE Bradbury , FL Crowe , PN Appleby (2014) Serum concentrations of cholesterol, apolipoprotein A-I and apolipoprotein B in a total of 1694 meat-eaters, fish-eaters, vegetarians and vegans. Eur J Clin Nutr 68, 178183.

36. PN Appleby , GK Davey & TJ Key (2002) Hypertension and blood pressure among meat eaters, fish eaters, vegetarians and vegans in EPIC-Oxford. Public Health Nutr 5, 645654.

40. TJ Key , PN Appleby , EA Spencer (2009) Mortality in British vegetarians: results from the European Prospective Investigation into Cancer and Nutrition (EPIC-Oxford). Am J Clin Nutr 89, 1613S1619S.

41. MJ Orlich , PN Singh , J Sabaté (2013) Vegetarian dietary patterns and mortality in Adventist Health Study 2. JAMA Intern Med 173, 12301238.

43. Y Tantamango-Bartley , K Jaceldo-Siegl , J Fan (2013) Vegetarian diets and the incidence of cancer in a low-risk population. Cancer Epidemiol Biomarkers Prev 22, 286294.

44. MJ Orlich , PN Singh , J Sabaté (2015) Vegetarian dietary patterns and the risk of colorectal cancers. JAMA Intern Med 175, 767776.

45. JE Cade , EF Taylor , VJ Burley (2010) Common dietary patterns and risk of breast cancer: analysis from the United Kingdom Women's Cohort Study. Nutr Cancer 62, 300306.

47. DL Thorpe , SF Knutsen , WL Beeson (2008) Effects of meat consumption and vegetarian diet on risk of wrist fracture over 25 years in a cohort of peri- and postmenopausal women. Public Health Nutr 11, 564572.

49. LT Ho-Pham , ND Nguyen & TV Nguyen (2009) Effect of vegetarian diets on bone mineral density: a Bayesian meta-analysis. Am J Clin Nutr 90, 943950.

50. LT Ho-Pham , BQ Vu , TQ Lai (2012) Vegetarianism, bone loss, fracture and vitamin D: a longitudinal study in Asian vegans and non-vegans. Eur J Clin Nutr 66, 7582.

51. FL Crowe , PN Appleby , NE Allen (2011) Diet and risk of diverticular disease in Oxford cohort of European Prospective Investigation into Cancer and Nutrition (EPIC): prospective study of British vegetarians and non-vegetarians. BMJ 343, d4131.

55. NS Rizzo , J Sabaté , K Jaceldo-Siegl (2011) Vegetarian dietary patterns are associated with a lower risk of metabolic syndrome: the adventist health study 2. Diabetes Care 34, 12251227.

56. S Tonstad , E Nathan , K Oda (2014) Prevalence of hyperthyroidism according to type of vegetarian diet. Public Health Nutr 18, 14821487.

57. GE Fraser & DJ Shavlik (2001) Ten years of life: is it a matter of choice? Arch Intern Med 161, 16451652.

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Proceedings of the Nutrition Society
  • ISSN: 0029-6651
  • EISSN: 1475-2719
  • URL: /core/journals/proceedings-of-the-nutrition-society
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