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Anonymous
People didn't evolve to eat mostly meat. Eating protein-rich lean meat is a trick to let us get away with eating energy-dense starch like bananas and tubers, and calorie-vacant but vitamin-rich vegetables. "Meat & 2 Veg" is the natural human diet, plus opportunistic eating of the rare sweet fruits and rich, fatty meats.
The problem is, we gained control over our environment, and now we are surrounded by sweets and fatty meat dishes, which are often not only cheaper and more readily available, but more calorie-dense than natural fruits and rich meats.
Now our opportunistic food targets have become our main diet, leading to overeating and... is "misnutrition" a word? I mean, you're not short of anything you need, but it's coming in awkward proportions, leading to things like diabetes.
So yeah, too much protein is bad for you, just like too much of anything is bad for you. Beyond calories (and protein is about as calorie-rich as starch), protein metabolism makes different waste product, and your body can struggle to deal with an excess of them. You should keep your protein intake in balance with your fat and starch intake.
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