Recommend a method for my own use: apple diet. For five days, replace three meals a day with apples, one big apple for each meal, drink plenty of water, and don't touch other things, such as milk, yogurt and other fruits. Reduce your activity and stay in bed if you have nothing to do. If you can't stand so many days, you can shorten it to three days.
When returning to a normal diet, remember: don't go back to the past eating habits at once, drink some rice porridge and eat some light dishes on the first day, and gradually recover day by day and return to the past diet.
I used this method in my freshman year. At that time, because I climbed the sixth floor, I only persisted for four days, lost eight pounds and did not rebound. Then I adjusted my eating habits, that is, I changed my dinner to apples or pure oats, and gradually lost four or five pounds ... but I need to remind you that this apple diet is enough once, don't use it twice.
Don't use it if you are in poor health. Instead, get up in the morning and drink 500ML of light salt water. Eat oats and soybean milk for breakfast, apples when you are hungry in the morning, more vegetables and less food for lunch, oats or big apples or a pack of yogurt at night. Refuse any snacks at ordinary times and drink plenty of water!
These are all the methods I have personally practiced ~ I hope they are useful to you ~