the sort of food usually eaten (by a person, community etc); the sort of food (to be) eaten by a person in order to lose (or gain) weight
abstinence from food
Cases of word usage
1) a sweet cancer causing substance often used instead of sugar used for example in Coca Cola (especially in diet Coke), Pepsi Cola, juices, any other soft drinks, almost every dessert, cakes etc (saccharine)
2) a person trying to become lighter using a diet (weight-watcher)
