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Which ungulates have such delicate constitutions that they can't eat soy or wheat or (what they actually eat) corn?

I didn't say they can't eat it - obviously they can. The post I replied to specifically called out that they were sticking with meat because humans hadn't evolved to eat plant-based or lab-grown meat, and then implied their nutrition would suffer if they gave up meat. If that's correct, it must also then affect livestock's nutrition, since they didn't evolve to eat a soy/wheat or, as you correctly call out, corn diet. So I asked if they avoid meat fed on this "not evolved to eat" diet as well.

Certainly their outcome does change based on diet. You can compare corn fed, grass fed - corn finished, grass fed and finished, and wild game.

In all cases, there are nutrients and proteins that you cannot find in plant based alternatives. If you are vegetarian or stronger, you have to supplement with pills to get the things that are not in your diet. It is unclear whether lab-grown will lack nutrients found in natural meat, or if artificial supplementation is really equivalent.

Hence the desire to stay close to our evolutionary roots. Same idea as walking a lot and squatting to duce.

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