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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Replying to @KetoCarnivore @zoeharcombe
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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Replying to @GidMK @zoeharcombe
I said that as well, but the relevance depends on the question. If the question is "Does going on a vegetarian diet tend to cause depression?" That's different from "Does it have to?", because it would be looking at what people do, not what they could do.
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I didn't mean to suggest Jacka's work was epidemiological. Twitter threads get so tangled. I think this is where we are: I started with: there's some epidemiology suggesting an association, and some plausible mechanisms for vegetarianism to cause depression. Then
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You said the epidemiology is weak and interventions may suggest benefit to vegetarian diets. I said I thought Jacka's work suggests on the contrary meat is critical, but I'd have to dig.
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That study definitely is epidemiological, it's just not comparing meat to no meat. All three groups ate meat, just in differing amounts and patterns (Traditional, Western, Modern)
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Replying to @GidMK @zoeharcombe
Ok, yes, you're right. I misremembered and didn't verify my memory there. Thanks for the correction.
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