It's possible, but it's all because of personal physical changes. Four kilograms a month and one kilogram a week are healthy in theory, but there is always a bottleneck in the process of slimming. It is effective to lose weight at first. After a certain period of time, the body will gradually adapt to the diet and exercise at this time, and it will stagnate. However, as long as you insist on adjusting your exercise on the original basis so that your body consumes more calories than you get, you will definitely continue to lose weight. It's only a matter of time. As long as you keep 1200 calories every day, you can't reduce calories, otherwise you can't lose weight healthily!