Are you serious? What would ever lead you to think that such a limited diet could be healthy? Humans evolved to eat everything.

It's very hard to get enough protein for muscle building eating anything else without going over my calorie goals, so I settled into a routine of chicken breasts and coffee with milk for the most part. Chicken breast is allegedly very healthy overall, and whole milk has necessary fat and vitamins. I do still eat other things a few times a week.

Yikes. That's just so far off base I don't even know where to begin correcting the misconceptions.

Nothing I said is wrong. White chicken meat is considered a good food and you need some dietary fat, and it really is hard to get 170g of protein under 1800 calories without a lot of it being chicken. I've tried protein shakes but they got old.

What does "good food" even mean? Considered by who? Are you even familiar with protein quality metrics?

Your comments are not even wrong. They're just completely off base and reflect a fundamental misunderstanding.

Guess all those world class bodybuilders eating chicken are killing themselves with low quality protein.