This meaning talks about what a person or animal eats every day. It can be all the food they usually eat, not just special food.
My diet is full of fruits and vegetables.
Dogs need a healthy diet every day.
Here, 'diet' means a special way of eating to change the body, like losing weight or staying healthy. It is a plan with specific rules about food.
She is on a diet to lose weight.
I follow a diet to stay healthy.
This meaning uses 'diet' to mean a group of people who meet to make laws or decisions. It is often old or from some countries.
The old diet met to discuss laws.
The diet voted on new rules today.
This meaning refers to the full quantity or sum of food or drink eaten often or during special times like a day or meal.
Sugar makes up part of my diet.
The diet of this animal includes plants.
In this meaning, 'diet' is a special eating plan given by doctors to help health problems or keep a patient well.
The doctor recommended a low-salt diet.
She follows a diet for her illness.
