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
The real reason is that animals evolve to get all their nutrients from the food that’s available to them. For example a cow’s four stomachs and long digestive track are perfect to take what they need mostly out of grass. Since we acquired a wide variety of available meals, we stopped making certain key nutrients because it was cheaper to get them through just eating, adapting our bodies to this lifestyle, making it needed for survival.
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