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Humans are pretty unusual in their inability to synthesize vitamin C (in humans, scurvy is caused not just by a lack of dietary vitamin C but the important factor that we can't simply make our own). Wikipedia lists just a few mammals as examples of those unable to synthesize vitamin C: simians, tarsiers, capybara, and guinea pig. None are obligate carnivores....


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About 20% of alcohol is absorbed right through the stomach after drinking. This means alcohol could have a rapid effect on other aspects of digestion. Specifically, it could affect the rate of gastric emptying, which would then affect how quickly other food is digested. I found one paper which I think supports a faster rate of emptying, but another that ...


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To add to Bryans answer there are a few other issues. mainly pickiness and brains. Human can handle an all animal diet surprisingly well, look at the modern Mongolian nomad diet, which is exclusively animal based. One problem we see in modern humans in industrialized nations is they often avoid eating organ meats, eating only muscle tissue "meat" ...


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My answer may be a little basic, but I think it is comprehensive: Many elements are special; for instance, many metal ions such as iron or cobalt are required as cofactors or in catalytic sites due to their chemistry. Oxygen is highly electronegative, that also grants it some of its functions. But... without delving too much into things... chloride is the ...


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