Patients with constipation rarely lose weight, mainly for several reasons: First, patients with constipation will lead to a decrease in basal metabolic rate, because food is absorbed into the blood in the small intestine and then transported into the blood, if constipation occurs, waste will accumulate in the intestine, and nutrients that are not absorbed will accumulate in the fat at the periphery of the cells, leading to thickening of visceral fat and subcutaneous fat, and the organism will tone down because of the lack of sufficient nutrients Basal metabolic rate, to ensure that the existing nutrition can support metabolism. Second, constipation and obesity will lead to a vicious circle, because long-term non-defecation will lead to psychological stress, anxiety and depression, feedback to the intestinal tract to reduce intestinal transport function, can lead to a further reduction in metabolism, weight will continue to rise.