Our biology shows distinct herbivorous traits. Our saliva contains plant-digesting enzymes absent in carnivores. Our stomach acid is mild (pH 4-5) compared to carnivores (pH 1), and our intestines span 10-11 times our body length, matching other herbivores' ratio of 10-12, while carnivores' intestines are just 3-6 times their body length. Physical features like fleshy lips, flat nails, and small mouths align with herbivorous anatomy. While humans can digest meat, our digestive system's structure and chemistry match the profile of plant-eating animals.

So why don't I feel good when I eat plants?

Our biology also shows that we are either male or female. Binary. In our genes.