Question

which statement describes a nutritionally balanced diet?
it consists mostly of protein.
it provides equal amounts of protein, carbohydrates, and fats.
it includes enough, and not too much, of all essential nutrients.
it consists of three small meals, each totaling about the same number of calories.

Explanation:

A nutritionally balanced diet should have enough of all essential nutrients (like proteins, carbohydrates, fats, vitamins, minerals etc.) and not too much. Having only protein (as in "It consists mostly of protein") is unbalanced. Equal amounts of protein, carbs, and fats is a simplistic view - actual balance depends on individual needs. Three small meals with same calorie count doesn't address nutrient variety. But "It includes enough, and not too much, of all essential nutrients" is a general principle of a balanced diet.

Answer:

It includes enough, and not too much, of all essential nutrients.