Most animals have a fairly simple diet, carnivores eat only meat their whole life, cows eat exclusively grass etc. So why are human bodies so picky and need a balance of protein, fat, carbs etc from different sources to perform well?
In: Biology
It isn’t. Humans can and do quite easily reach breeding age and reproduce successfully without a balanced diet, provided they have enough calories. We need to eat reasonably well to have consistently good health and live to old age, but the importance of those things is largely an emergent human/social construct. Animals in the wild aren’t necessarily “healthy” as we define the term. Many are malnourished, have parasites, etc. Entire regional populations of some animals can be stunted and unhealthy.
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