Will a Vegetarian Diet Make You Depressed?

diet depressionThe recent article in Women’s Health Magazine about the “scary mental health risks” associated with meatless diets has—not surprisingly—received lots of attention. People love to hear bad news about vegetarian and vegan diets, after all.

Author Jill Waldbieser pulled the article together from the usual hodgepodge of questionable resources—in this case a few anecdotes plus comments from Vegetarian Myth author Lierre Keith. She also referenced two studies, one in Australia and one in Germany.

I took a quick peek at the German study, which assessed diet and mental health in a group of about 4100 subjects.(1) Subjects who said they were vegetarian or predominantly vegetarian were 15% more likely to report depressive disorders. But they were also likely to have adopted their vegetarian diet after developing depression. The researchers concluded that being vegetarian did not cause people to be depressed. Rather depressed people—for whatever reason—were more likely to choose a vegetarian diet.

It’s also worth noting that vegetarians in this study were people who said they eat no meat or very little meat. The German word for meat doesn’t include poultry, so it’s not at all clear that all of these “vegetarian” subjects actually ate a vegetarian diet.

I couldn’t find the Australian study that was mentioned in the Women’s Health article. It appears to be an unpublished survey, and the lead investigator reached the same conclusion as the German researchers—that depressed people are more likely to adopt vegetarian diets.

So there you have it—the case for mental health risks of a vegetarian diet is based on two pieces of research–one unpublished, both misrepresented– plus an anecdote from a psychiatrist, another from a dietitian who promotes juice cleanses, and the opinion of an ex-vegan book author who is woefully uninformed about nutrition.

None of this has me feeling too worried about vegetarian diets and risk for depression.

In fact, research offers some reassurance about meatless diets and mental health. For example, a small cross-sectional study of Seventh-day Adventists found that a vegetarian diet was associated with better mood.(2) The same researchers found that vegans also experienced mental health benefits compared to omnivores.(3) And in a small, short-term pilot study, they found that several mood scores improved when omnivores stopped eating meat.(4) Vegetarian diets have also been linked to better mood among women in Iran and among new moms in Austria.(5,6)

Finally, vegan diets were associated with less stress and better mental health in a workplace intervention study conducted by PCRM. (7) In this case, the subjects following a vegan diet also received both in-person and online support and instruction. So it’s not possible to know whether improvements in mental health were due to the diet or to the social support. But there is good reason to assume that the switch to a healthy plant-based diet had at least something to do with their improved mood.

One theory is that lower intakes of arachidonic acid, a fatty acid that is abundant in foods from factory farmed animals, offer protection against depression. Arachidonic acid promotes inflammation and inflammation has been linked to a number of chronic illnesses including depression.(8,9)

A higher intake of fruits and vegetables is associated with lower levels of inflammation and possibly with improved mood.(10) This might explain in part why other plant-based diets like Mediterranean diets have also been linked to lower risk for depression.(11) I suspect that soy consumption might also be part of the explanation for lower rates of depression among some groups of vegans and vegetarians.(12)

Overall, we don’t have tons of data on mental health of vegetarians and vegans, but what we know seems reassuring. A diet packed with whole plant foods can reduce inflammation which appears to be good for mental health. Individual plant foods may also offer some protection.

Of course, there are potential shortfalls in vegan diets that could raise risk for depression. Deficiencies of iron, vitamin B12 and vitamin D and of the long chain omega-3 fats DHA and EPA in particular can all affect mood and mental health. None of these deficiencies are unique to vegan diets, though, and all are easily prevented through appropriate supplementation and food choices.

In short, going vegetarian or vegan is not likely to make existing depression or anxiety worse or cause depression in someone who doesn’t currently have it. If anything, it may actually make you feel better. And even if it doesn’t, at the very least your vegan diet is a safe and healthy choice that reflects your values of compassion. That’s something to feel good about.

 

  1. Vegetarian diet and mental disorders: results from a representative community survey. Michalak J, Zhang XC, Jacobi F. Int J Behav Nutr Phys Act 2012;9:67.
  2. Vegetarian diets are associated with healthy mood states: a cross-sectional study in seventh day adventist adults. Beezhold BL, Johnston CS, Daigle DR. Nutr J 2010;9:26.
  3. Vegans report less stress and anxiety than omnivores. Beezhold B, Radnitz C, Rinne A, DiMatteo J. Nutr Neurosci 2015;18:289-96.
  4. Restriction of meat, fish, and poultry in omnivores improves mood: a pilot randomized controlled trial. Beezhold BL, Johnston CS. Nutr J 2012;11:9.
  5. Empirically derived dietary patterns in relation to psychological disorders. Hosseinzadeh M, Vafa M, Esmaillzadeh A, et al. Public Health Nutr 2015:1-14.
  6. Nutrition health issues in self-reported postpartum depression. Hogg-Kollars S, Mortimore D, Snow S. Gastroenterol Hepatol Bed Bench 2011;4:120-36.
  7. A multicenter randomized controlled trial of a nutrition intervention program in a multiethnic adult population in the corporate setting reduces depression and anxiety and improves quality of life: the GEICO study. Agarwal U, Mishra S, Xu J, Levin S, Gonzales J, Barnard ND. Am J Health Promot 2015;29:245-54.
  8. So depression is an inflammatory disease, but where does the inflammation come from? Berk M, Williams LJ, Jacka FN, et al. BMC Med 2013;11:200.
  9. Dietary inflammatory index, cardiometabolic conditions and depression in the Seguimiento Universidad de Navarra cohort study. Sanchez-Villegas A, Ruiz-Canela M, de la Fuente-Arrillaga C, et al. Br J Nutr 2015;114:1471-9.
  10. The association between fruit and vegetable consumption and mental health disorders: evidence from five waves of a national survey of Canadians. McMartin SE, Jacka FN, Colman I. Prev Med 2013;56:225-30.
  11. Mediterranean dietary pattern and depression: the PREDIMED randomized trial. Sanchez-Villegas A, Martinez-Gonzalez MA, Estruch R, et al. BMC Med 2013;11:208.
  12. Effects of antidepressants and soybean association in depressive menopausal women. Estrella RE, Landa AI, Lafuente JV, Gargiulo PA. Acta Pol Pharm 2014;71:323-7.
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11 Responses to Will a Vegetarian Diet Make You Depressed?

  1. Dori December 30, 2015 at 1:57 pm #

    Thank you for this! As a vegetarian (and aspiring vegan) who has suffered from depression since childhood, I find this very reassuring!

    • Ginny Messina December 31, 2015 at 6:05 am #

      Dori, as you move toward veganism, make sure you’re taking appropriate supplements. This post will point you in the right direction: http://www.theveganrd.com/2010/11/recommended-supplements-for-vegans.html

      It’s important for everyone, but especially for those who are dealing with issues of depression. Let me know if you have questions about this and enjoy your journey to veganism!

  2. Corina December 30, 2015 at 11:09 pm #

    I like so much your posts…they express exceptionally well my own opinions. Thank you for all you do. Your help for those embracing the vegan lifestyle is huge, a normal voice, full of common sense in an otherwise conflictual and extremist frame of thouhts.

    • Ginny Messina December 31, 2015 at 6:05 am #

      Thank you, Corina!

  3. Sophia December 31, 2015 at 2:22 am #

    Nutrition apart, don’t you think being vegan can actually put some pressure on your men,tal health. Being aware of the immense suffering of animals and not being able to share that concern with anyone around you (if you’re the oinly vegan you know) can be really depressing. What do you think about that? And do you have any methods of self-care you would recommend for vegans in this situation?

    • Ginny Messina December 31, 2015 at 6:12 am #

      Yes, I do think that being vegan can feel alienating and can foster feelings of depression and stress–related to our heightened awareness of animal suffering and the fact that we deal with this well outside of the mainstream.

      Sophia, have you read my book “Vegan for Her?” I shared some thoughts about self care in the chapter on depression. I’ll try to do a blog post in the near future that covers that information for those who haven’t read the book.

  4. Karen December 31, 2015 at 9:35 am #

    Ginny, thank you for always being on the alert for and responding to the misinformation out there. You are providing a sweet service to us all,

  5. Vik January 1, 2016 at 2:52 pm #

    Thank you for the nice post.
    The german word for meat actually does include poultry.

    • nibblrrr February 10, 2016 at 7:03 am #

      I was baffled by this claim too, but it is actually from the research paper (1) itself. All three authors publish in and seem to speak German (at least two natively). However, DGE, German consumer service, Duden dictionary, and Wikipedia disagree. The expression “Fleisch und Geflügel” (“meat and poultry”) seems to be common for emphasis (esp. in the industry?), but in the context of the question it seems pretty clear to me that “vegetarisch” and “kein Fleisch” would be about poultry, too.
      Maybe common language use was different in 1998 when the survey was conducted, or still is among people older than me?
      Anyway, I’m glad that the science is reassuring. Thanks for the post, Ginny!

  6. krist0ph3r May 5, 2016 at 3:29 am #

    I’m confused about how a vegetarian diet can be called more natural, when supplements are not natural? And many of the supplements themselves are of animal origin, so I’m not sure if the diet itself can be called vegetarian any more.

    Most of the everyday medicines we use were not approved for humans without being tested on animals. Our doctors learn surgery on animals. Like it or not, it seems like our existence and progress seems dependent on animals.

    Anyway, India has a lot of people who have been vegetarian since birth, so research on the subject can be done here, to eliminate any possible bias from people who have mental health issues turning vegetarian.

    • Ginny Messina May 10, 2016 at 7:24 am #

      I don’t refer to a vegan diet as “more natural.” My stance is that as long as we can be healthy on a vegan diet, we have an obligation to eat that way since it does the least harm to animals. The only supplement that all vegans require is vitamin B12 and many meat-eaters need this supplement, too. Most people–no matter what they eat–also need vitamin D supplements. These supplements are all available in vegan forms. And yes, there are a lot of things that we can’t avoid that are or were derived from animals. It doesn’t mean that we shouldn’t do the best we can!

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