Thank you. I hadn't seen that yet. In a (very cursory) scan through it, I only see the reports of positive associations between depression and vegetarianism, though, not a suggestion that there might be a benefit, but I'll look again when I have a little more time.
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Replying to @KetoCarnivore @zoeharcombe
The systematic review is a very good place to start. I've found 6 obs studies altogether, 3 positive and 3 negative, as well as a handful of RCTs of variable quality
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Replying to @GidMK @zoeharcombe
It's my understanding that Felice Jacka has found that red meat is a critical factor for avoiding depression. It might be described in here: https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.2009.09060881 …. If that's not the one I'll dig for it later. As to plausible mechanisms, though,
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We do know there are many brain-essential nutrients that are either hard to get from plants, or that plant-based diets actively interfere with, or both. I think this can potentially be addressed, but it's an easy pitfall. The WHO and FAO discuss this problem wrt fortification:
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L. Amber O'Hearn Retweeted L. Amber O'Hearn
These are direct quotes from the linked document.https://twitter.com/ketocarnivore/status/1087054381286010885?s=21 …
L. Amber O'Hearn added,
L. Amber O'Hearn @KetoCarnivoreMy slides on the benefits of meat eating and detriments of a plant based diet. Quotes from: Allen, Lindsay, World Health Organization, and Food and Agriculture Organization of the United Nations. Guidelines on Food Fortification with Micronutrients. 2006. http://catalog.hathitrust.org/api/volumes/oclc/152582146.html …. pic.twitter.com/AiYsT8EAskShow this thread1 reply 0 retweets 2 likes -
Adding to that the several recent reports of deaths or severe handicapping in young children on careless vegan diets is sobering. The adult brain may need less than a growing one, but it's plausible that diets without animal foods could contribute to brain unwellness.
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So, it seems to me that if the epidemiology is weak and conflicting, there may be factors that aren't measured that are coming into play, such as supplementation, or other things that education might be a proxy for.
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On the other hand, there may be causality in the other direction: depressed people seeking to improve their health become vegetarian. It's very unclear.
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Finally (haha, ok, finally for now) I must be upfront with the fact that my own experience deeply colours my expectations here, since I grew up vegetarian and had progressive bipolar disorder as an adult, that has been in remission since stopping eating plants. I can't unsee it,
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even though I know it's a "one off", in a certain sense (though I know others who had the same experience). I don't know why this happened, but I've had a decade to think about it, and have found many ideas to help explain it, or confirm my biases, depending on view.
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So, here's the interesting point - I don't really see an epidemiological argument here. There's a study comparing a SAD-style diet to Mediterranean-style diets, and a hypothesis based on nutrient deficiency
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And the nutrient deficiencies largely seem to be speaking to a low-quality vegetarian diet - as I'm sure you're aware, these can all be rectified by carefully selecting the foods a person eats
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So...plausible? Not sure I'd agree. I'd argue almost certainly not epidemiological, because I can't see a single trial actually examining a vegetarian diet compared to one that includes meat
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