The effect of diet pills varies from person to person, and different people may have different reactions. Some diet pills may have a certain weight loss effect, but they also have some side effects. For example, orlistat is a legal diet drug, which can specifically inhibit the enzymes responsible for digesting fat in the gastrointestinal tract of human body, prevent the absorption of fat in the digestive tract, thus reducing calorie intake and achieving the purpose of weight control. However, 44% people can lose 5% weight within one year after taking Orlis, with an average of 2.6 kg.