food and drink considered in terms of its qualities, composition, and its effects on health: Milk is a wholesome article of diet.
a particular selection of food, especially as designed or prescribed to improve a person's physical condition or to prevent or treat a disease: a diet low in sugar.
such a selection or a limitation on the amount a person eats for reducing weight: No pie for me, I'm on a diet.
the foods eaten, as by a particular person or group: The native diet consists of fish and fruit.