A '''diet''' is the [[food]] and [[drink]] regularly consumed by a person or [[animal]]. The first principle of a healthy diet is simply to eat a wide variety of foods. [http://www.wellnessletter.com/html/fw/fwNut01HealthyDiet.html#] A poor diet can have an injurious impact on health.
Occasionally, person will change their eating habits for [[health]] reasons, such as a [[fat]] person who eats less food, or a [[diabetes|diabetic]] who must avoid [[sugar]] (carbohydrates).