Generally speaking, there are 10 to 3 billion fat cells in the human body, while the number of fat cells in obese people is 10 billion. Fat cells only grow in childhood and adolescence, and the number of fat cells is basically constant after adulthood and will not change. If you always overeat, the fat cells in your body will expand rapidly and increase in number. No matter how you exercise and diet, the number of fat cells in your body will not decrease. When you lose weight, you just shrink some water, and the amount will not be less. This is also the reason why fat people tend to rebound easily by general weight loss methods.
The common way to lose weight can only be similar to the sewer, and it will be blocked after a while. To really solve the obesity problem, we can only fundamentally adjust our physique and reduce our body's ability to transform and store fat.