If you suddenly lose weight 10 kg in a month, your skin may be slack and your mental outlook may be ugly. You may not have really lost fat, but you may have lost your lean body mass and the muscle we want most. Losing muscles will not pay off.
It is best to control the weight loss speed reasonably and not rebound. The speed of losing weight is to control total energy, increase energy consumption, balance nutrient intake, and weigh yourself every morning.