If MM can make up her mind, the effect of dieting and losing weight will be immediate. Needless to say, don't eat dinner, don't eat snacks, eat more breakfast and have a good meal. If you are in a hurry, skip lunch, drink 8 glasses of water every day and rub your stomach 30 times in the evening to ensure a normal day.

My classmate tried, and lost 2 kg on the first day, 5 kg in three days, and about 10 kg a week.

The important thing is that you must keep it up. You can't skip eating today, but eat a lot when you are hungry tomorrow. Overeating will make you fat. I wish you success!