There is an example around me, that is, my classmates live in the same dormitory. She lost 30 pounds in a month, but she persisted. She only eats a cucumber and a tomato every day, and nothing else. Meat and rice are absolutely forbidden.

It is quite effective for her to lose 30 pounds a month, provided that she must not eat or drink illegally during weight loss. If she eats too much at one meal, her previous weight loss will be in vain and she must start over.