CodenameDarlenWhy does cats (and similar animals) can live with the exact same food every day, but we (humans) need a variety of food to survive?
Cats and similar animals are adapted to specific environmental niches, but humans are generalists. One of the drawbacks of being generalists is that we’re not specialized enough to fully subsist on any single food source.
We can definitely subsist on a single food source if it’s been engineered to be nutritionally complete like pet food has.