how to use diet in English

 "Diet" can have a few different meanings in English:

• The types of food that a person or animal usually eats:

  • "The Mediterranean diet is rich in fruits, vegetables, and olive oil."
  • "A balanced diet is essential for good health."
  • "The panda's diet consists mainly of bamboo."

• A special course of food to which a person restricts themselves, typically for the purpose of weight loss or for medical reasons:

  • "I'm going on a diet to lose weight for my wedding."
  • "The doctor put her on a low-sodium diet."
  • "He's been on a strict diet for the past month."

• (Less common) A special course of food for a particular purpose or during a particular period:

  • "The athletes followed a special diet before the competition."

I hope this helps!