1, eat less meat and more vegetables or fruits. Although this method often says that it feels useless, the effect is actually good.
2, running more than 400 meters a day, sweating will have an effect.
3, you can eat some diet pills in moderation. Note: the right amount! Some drugs will have side effects on you!
The last point is to persist and don't give up after a week. If you can't handle it, make a slight adjustment. Health comes first.