There aren’t secret super foods out there accessible only by the rich that are like $100/serving that make you live forever. So far, everyone still ages and everyone still dies. Those who don’t take care of their body are the ones who have higher risk of health complications. It’s the same as it’s always been.

Would it be more convincing, if it was more complex? When it comes to the macronutrients (protein, carbohydrate, and fat), it typically does boil down to number/percent of calories provided by each. The kind of fat or carb may sometimes come into play as well, but it does often boil down to numbers.

This approach is supported in the scientific literature.