diet

The act of restricting your food intake (or your intake of particular foods).

A legislative assembly in certain countries (e.g., Japan).

A prescribed selection of foods.

The usual food and drink consumed by an organism (person or animal).

Eat sparingly, for health reasons or to lose weight.

Follow a regimen or a diet, as for health reasons.

“He has high blood pressure and must stick to a low-salt diet”