There isn’t one. Move on. First world humans spend undue energy searching for a perfect nutritional formula that will turn us into bronzed, teutonic gods. This is a little silly considering the fact that a fair percentage of the human population doesn’t get enough of anything to eat.
Getting enough calories is important. Getting enough vitamins is important. Not eating foods that make you sick is important. Beyond that, people are pretty adaptable. Most of us are just making do with what we can get. As a vegan, I could argue that dairy products are “bad for you” and “unnatural.” But clearly millions of people survive, many of them quite healthily, while consuming dairy. So I don’t make arguments about what a person should or shouldn’t eat based on nutrition. I make them solely on ethical grounds. I refuse to eat dairy not because it’s bad for me, but because it’s bad for cows.
Eat with your ethics. Because you can.