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Nornagest comments on Rationality Quotes February 2014 - Less Wrong
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Our ancestors were dietary omnivores. As a result, we are optimized for that diet, and while that doesn't mean that it's the best possible diet, it is a good reason to believe that you're better off eating some meat. If you're just concerned about you, that's a pretty good criticism of vegetarianism. If you're concerned about animals, or you believe that a god you trust told you not to eat meat, or something like that, it's still a valid criticism, but it's a lot less important and it doesn't address the main reason you chose to be a vegetarian.
I am not a vegetarian, but the usual rebuttal to this is that the standard Western diet bears little more resemblance to the ancestral version than the vegetarian alternative: the nutritional profile of largely sedentary farm animals, lots of grains, and cultivated fruits and vegetables doesn't look much like that of (say) wild tubers, berries, fish, and occasionally an antelope that you pursued into exhaustion and clubbed with a rock. This as far as I can tell is true (albeit complicated by the fact that we have little good data on what our ancestral diets actually looked like, evocative pictures aside, and also by the fact that the best modern analogues we have are fantastically varied), but it isn't a positive argument in favor of vegetarianism.
The analogy to sexual behavior is left as an exercise.
I am a vegetarian, but I still feel like vegetables and meat are really different. If our ancestors ate meat, and we don't, that's a significant difference, even if the precise meat and vegetables aren't the same.
Vegan diets generally lack necessary micro-nutrients unless integrated with supplements or fortified foods.
Vegetarian diets that include diary and/or eggs are usually considered healthy.