For students, losing weight requires both physical health and mental state. The goal of losing 20 pounds in seven days is very unrealistic and may cause serious harm to the body. In order to lose weight healthily and effectively, here are some methods suitable for students to lose weight:

1. Balanced diet: ensure three meals a day, eat as many vegetables, fruits and protein as possible, reduce foods high in sugar, fat and salt, and replenish enough water in time.

2. Control calories: According to your physical condition, set appropriate calorie intake, limit the total daily calorie intake, control carbohydrate intake, and eat protein and good fat in moderation.

3. Exercise to lose weight: Exercise properly every day, such as walking, running and swimming. Exercise, speed up metabolism and burn fat.

4. Regular work and rest: Ensuring adequate sleep time and regular work and rest habits are very important for good health.

5. Decompression: Keep a happy mood during weight loss, and you can carry out stress-relieving activities such as stretching and meditation.

Please pay attention to these persistent implementation, and don't lose too much weight and cause physical problems.