Sometimes it is difficult for patients to understand how to pass stool without eating or drinking. And sometimes they don’t understand drinking laxatives before the colonoscopy, “I didn’t eat in the morning! Why can’t I have a colonoscopy?” It is said that pie can fall from the sky, but it can also fall from the poop? Here we do a simple analysis from the composition of feces to help you figure out where this shit comes from. Analysis of the composition of the poo: 1, water: (75% of the total amount of feces) Many people think that the water is drunk in, do not eat and drink where to come from the water? Let’s look at the daily body secretion of digestive juices: people daily by a variety of digestive glands secrete a total of 6-8L digestive juices, saliva is about 1 ~ 1.5L, gastric juice is about 1.5 ~ 2.5L, pancreatic juice is about 1 ~ 2L, bile is about 0.8 ~ 1.0L, small intestine fluid is 1 ~ 3L. you have a lot of water itself. Of course, all this water cannot be excreted, most of it is absorbed back into the body. 2, solids in the stool: (25% of total stool) 3, bacteria: (solids 30%) There are many kinds of bacteria in the colon, E. coli 70%, anaerobic bacilli 20%, and streptococci, Aspergillus, Staphylococcus, Lactobacillus, bacilli and yeast. Solid part of the bacteria up to 50%, but most of the bacteria have died when discharged. 4, fat: (solid 10-20%) which contains bound fatty acids (5%-15%), free fatty acids (5%-13%), neutral fat (1%-5%). The fat content in the stool of normal breastfed children is 50% higher than that of adult stool, and the fat content in the stool of young children is also 30% higher, and neutral fat is predominant. If the total amount of fat in the stool for 24h exceeds 6g, it is called steatorrhea. 5, inorganic substances, protein 2% to 3% for protein, 10% to 20% for inorganic salts. 6, this is what you eat: (solid 30%) 30% is undigested residual food and solid components of digestive juices such as shed epithelial cells. We can see that the proportion of food residues in the feces does not account for the absolute majority, but does not preclude you from binge eating, binge eating, binge eating ……. Eat more, eat more, eat less, eat less, do not eat also row! After the above analysis, I believe that we understand that there will still be fecal discharge in the fasting state, but the same question we may be troubled again, that is, why there is feces early after surgery how not to discharge it? I believe that exhaust (is fart) we all understand, because the early postoperative intestinal peristalsis is not fully recovered, and after all, less food residues constitute feces, resulting in insufficient fecal volume, not enough rectal stimulation, so did not cause defecation reflex, so that is not inconvenient, the time has not arrived! Wait patiently for that fart and that bubble of shit.