The short answer is “a balanced diet,” which means foods that are high in protein and low in carbohydrates and fat.
Running ten miles a day and eating a balanced diet of organic fruit and nuts?
So he must know something of dietetics and he must have a balanced diet.
"Vegetables," said Marcus, watching to make sure his son selected a balanced diet.
So far as the food quality of the chestnut is concerned it is not a balanced diet, mostly sugar, but it is a splendid food.
"Uh-huh," grunted Sarah, interested at that moment in a description of a balanced diet for her pets.
Black bread, potatoes, and sometimes cabbage, make up his "balanced diet."
balanced diet n.
A diet that furnishes in proper proportions all of the nutrients necessary for adequate nutrition.