Помогите ответить на вопросы: what is diet? why people go on

What is diet? - Diet is a special complex of meals to eat in order to keep healthy and feet.
Why people go on diets? - People go on diets because they want to be healthy and beautiful.
Whether you have a healthy lifestyle? - Yes, I try to have a healthy lifestyle.
Why? - I have a healthy lifestyle because I care about my body and my health.
Which you prefer: junk food or healthy food? - I definitely prefer healthy food.
Why? - I prefer healthy food because I want to keep fit and look good.