Actually, that's not the real reason the USDA is so compliant. The real reason is that they have been bought, sold, and paid for since the USDA was invented. This is documented, but not well known, as you can imagine. If humans were huge rats, we would need the amount of protein we eat every day in this country. Baby rats cannot survive on human mother's milk, yet we can.
Gorillas grow to be big and strong on leaves, roots, and fruits.
Our digestive tracts are indistinguishable from gorillas' digestive tracts, and I mean this in very scientific terms. Our dentition is also closer to gorillas' than to any of our other cousins. I found out how many grams of protein I was supposed to get per day and made sure I had plenty of beans, peanut butter, and tofu. I balanced my amino acids by combining proteins. Frankly, I had hummus coming out my ears.