Feeling thin and not losing weight may be due to a decrease in body fat and an increase in muscle mass. If you feel thin and your weight hasn’t changed, it suggests that the body may be undergoing fat loss. Exercise does not consume protein in the muscle, but only consumes subcutaneous fat, while muscle mass increases, resulting in the phenomenon of feeling thin, but not changing weight. To make weight loss, you need to exercise, reduce the intake of greasy, spicy foods, and also reduce sweets and other foods containing trans fatty acids. Regular work and rest time, avoid staying up late, develop good habits, and eat more fresh fruits and vegetables.