Fruit guide is a kind of catheterization drug, the main ingredient of fruit guide is phenolphthalein, after taking fruit guide can stimulate intestinal peristalsis, resulting in increased secretion of intestinal fluid, intestinal absorption of nutrients is reduced, so as to play the role of laxative, improve the symptoms of constipation, and can even lead to the role of diarrhea. So taking fruit guide tablets is able to lose weight, but fruit guide is a laxative, not advocated as a weight loss drug to take. The reasons are as follows: First, long-term eating fruit guide will make the intestinal nutrient absorption decrease, the lack of trace elements, vitamins, electrolyte disorders and the lack of energy supply may occur. Second, long-term eating fruit guide gastrointestinal contraction function will be inhibited, resulting in intestinal peristalsis weakness, easy to stubborn constipation after stopping the drug, and even intestinal necrosis. Therefore, although the fruit guide can lose weight, but do not advocate the fruit guide as a weight loss drug to use, scientific weight loss method is mainly reasonable control of diet, increase the amount of exercise.