1. At the beginning of losing weight, you not only controlled your diet, but also increased your exercise. After exercise, your body will store water.
2. Muscle increases, body fat decreases, and muscle density is high.
3, there is no reasonable control of diet.
If you haven't exercised before, suddenly start exercising. During exercise, our body will consume a lot of muscle glycogen and liver glycogen, which are the first substances to supply energy during exercise. After exercise, due to the stimulation of exercise, the body generally stores more glycogen than before. Glycogen is stored in water, and every 1g of glycogen storage needs at least 3g of water, so the body will store a lot of water and glycogen in the process of replenishing after exercise. This water has increased your body weight, so you have gained weight.
Of course, if you persist in this situation 1~2 weeks after your body adapts, you will definitely lose weight!
In the early stage of losing weight, if you don't control your diet reasonably, or your body is in a sub-health state, plus aerobic and strength training, your weight is likely to remain unchanged or even increase in the early stage. Sub-healthy people will have a protective mechanism in the early stage of losing weight, that is, reducing ability consumption.
Exercise reduces body fat and increases muscles, so the weight does not drop. Exercise consumes energy and promotes the oxidative decomposition of fat stored in the body, thus reducing fat. But at the same time, frequent muscle contraction and exertion during exercise will stimulate muscle fibers to thicken and increase muscle mass. In the body, the water content of muscle tissue is much higher than that of fat tissue, so muscle is "heavier" than fat.
Of course, measuring your measurements at this time is more accurate than measuring your weight!
The last possibility is that you don't exercise and your diet is not properly controlled. Losing weight is actually creating a reasonable calorie gap. If you just eat less than usual, but your energy intake is still greater than your body's energy consumption, then you will still gain weight.
PS: Losing weight in the true sense is not just a matter of weight. Think of a 200-kg fat man and a 200-kg muscular man. Maybe the muscular man is thin visually, so don't care too much about his weight, but look at his body fat, eat reasonably and exercise reasonably. Also, don't over-diet, the final result is often counterproductive.