Firstly, when we lose weight the calorie expenditure of our body decreases. Our metabolism decreases because less calorie is required to maintain and move a lighter body. Secondly, weight loss is always accompanied by increase in appetite. At the beginning of your weight loss journey, you might be able to control your hunger but as you reach near your goal, it may become difficult.
This is because of the hormone leptin, which tells our brain how much fat is stored in our body. In the starting of the weight loss journey, we have more stored fat, which leads to an increase in leptin level, resulting in loss of appetite. But with time, when we lose bodyweight, leptin level slows down, making us feel more hungry.
Both, change in the calorie expenditure and the effect of leptin in our body slow down the weight loss process in the end. But this happens for a very short period of time.
Excerpt from:
Weight loss: Why is it difficult to shed the last few extra pounds? - Times of India
