The odor of feces comes from indole and fecal odorant, which are substances formed by the decomposition of protein by intestinal bacteria. People who tend to eat in Europe and America, eating a lot of high-protein and high-fat food every day, will have bad stool. On the contrary, people who eat more cellulose smell better in stool.

The foul smell of stool is evidence of the deterioration of intestinal environment, indicating that the number of spoilage bacteria in the intestine is increasing, and the aging and deterioration of intestinal environment will promote human aging and illness. For the symptoms of indigestion, be careful not to eat too much at every meal, especially at dinner. Just take some drugs to help digestion, such as Baohe Pill, Muxiang Shunqi Pill and hawthorn pill.

Food residues are in the large intestine, and some water and electrolytes are absorbed by the mucosa of the large intestine. After fermentation and decay of bacteria, they become feces and are excreted. Feces contain undigested cellulose in food, epithelial cells shed from digestive tract, mucosal fragments and a large number of bacteria, as well as undigested digestive tract secretions, such as mucus, bile pigment, mucin and digestive juice. If you don't eat vegetables and miscellaneous grains, the composition of feces is always the same, that is, water accounts for 65% and solids account for 35%. The bacteria in the solid part are the most, accounting for one-third to one-half of the total. When the feces are discharged, most of the bacteria have died. There are also 2% ~ 3% nitrogen-containing substances and 10% ~ 20% inorganic salts, such as calcium, iron and magnesium salts. Fat accounts for 10% ~ 20%, one is decomposed fat that is not absorbed, the other is neutral fat from bacteria and epithelial debris, and there are a small amount of cholesterol, purine groups and vitamins.