What Are the Fundamental Tenets of Nutrition?

When people imagine going to the store and picking up healthy foods or drinks, what do you think they're drawn to? I notice also organic, am nongimo, low sugar, a loa fat, things like that. Listen, i still say all foods fit, so whatever you want. But at the same time, i don't want people to think that they have to spend a ton of money to be healthy.