Why does shit stink?

The reasons for the odor of defecation may be related to the following aspects: First, the odor of defecation may be caused by eating food, such as bean products, tofu, bean sprouts, bean skin, leeks, garlic and other foods; Second, the odor of defecation may be long-term constipation, dry stool, and fecal accumulation in the gastrointestinal tract, resulting in odor in defecation; Third, it may be that oral drugs that regulate intestinal flora imbalance make the stool dry, such as Bacillus coagulans, and the stool stinks; Four, some diseases can lead to bad stool, such as various types of acute chronic gastroenteritis, intestinal tuberculosis, gastrointestinal benign and malignant tumors and other diseases.