The reason why you will have very smelly feces may be related to dietary factors, or it may be caused by indigestion, gastrointestinal tract inflammation and other reasons. 1. Dietary factors: if you eat a lot of food containing high protein in the near future, after these foods enter the gastrointestinal tract, they will be decomposed and easily produce more ammonia, which will result in smelly feces. 2. Indigestion: If you regularly overeat in the near future, or consume a lot of food that is not easy to digest, it will easily lead to indigestion, resulting in more food stagnation in the gastrointestinal tract, which will cause fermentation, and then you may have smelly feces. 3. Gastrointestinal inflammation: common in acute gastroenteritis, proctitis, colitis and other diseases, due to the gastrointestinal tract there is an inflammatory reaction, in the role of pathogenic bacteria, it may cause a very smelly excrement. The odor of excrement, may also be related to other factors, if accompanied by obvious discomfort, should be as early as possible to seek medical attention, diagnose the cause, give targeted treatment.