Drink some yogurt after every meal, and eat some pineapple after eating meat. But a month 15kg is impossible to lose weight, and it is very harmful to the body. Two kilograms a week is easier.
Let me introduce the method of losing weight in freshman year: no dinner, no apples, no matter how hungry you are. Stand for at least half an hour after lunch, then sit down, drink more tea and green tea, and give up any drinks. Of course, you can also relax occasionally. It is best not to relax more than three times a year. Usually go out to do business, can walk and never take a car. You can continue to lose two pounds a week. I have a good appetite, so I don't eat dinner, and it's okay to have tea after dinner.
Please refer to your physical condition to make your own weight loss plan. Please remember that health comes first.
I wish you success!