Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism and excretion.
A fruit is a part of a flowering plant that derives from specific tissues of the flower, one or more ovaries, and in some cases accessory tissues.
In everyday usage, a vegetable is any part of a plant that is consumed by humans as food as part of a savoury meal. The term "vegetable" is somewhat arbitrary, and largely defined through culinary and cultural tradition.