[avinium]

It does matter what you eat. Not in the sense of "calories in, calories out" - which, as you mentioned, is simple biology.

But it is important in the sense of "which diet is easiest to follow?".

That will vary person to person. But for many people, the answer is low-carb/intermittent-fasting. It eliminates the blood sugar/hormonal response, requires less effort than regular eating, and still lets you eat palatable food.

[wetpaws]

High carbs high protein works just fine for me. Hell, there was the time (in college) where my diet consisted of ramen and chocolate and it still worked. I am with the op, as long as your weight dynamic is acceptable, you can eat whatever you want.

[avinium]

That's not really the point. Your diet works for you - great! Noone's saying it's biologically impossible.

But most people won't find it easy to regulate their caloric intake eating ramen and chocolate. They will find it much easier with vegetables, lean protein and high fat.