â€œDietâ€ is a word people use when they talk about eating food.
Diets are about eating the right quantity and type of food at the right time. When people talk about a diet, they are usually referring to a special kind of diet. People can change their diets to gain or lose weight, to get more vitamins, to avoid a food that makes them sick, or for other reasons.When someone says they are â€œdietingâ€, it means that they are trying to lose weight.
When the diet is not right, people can gain or lose weight. They may become overweight or underweight.
To get back to their normal weight, they need to change their diet. This may be very hard to do.
A diet is a) food and drink regularly provided or consumed b) habitual nourishment c) the kind and amount of food prescribed for a person or animal for a special reason.