Eating lard diarrhea may be physiological factors; may also be pathological factors, such as indigestion, pancreatic disease, liver and gallbladder disease. 1. Physiological factors: the body’s daily intake of three major nutrients, including sugar, protein and fat, the three major nutrients in carbohydrates are easily absorbed, followed by protein, while fat is not easily absorbed by the body. Lard is rich in fat, if you eat too much, is not conducive to gastrointestinal absorption, there may be diarrhea after eating. 2. Pathological factors: dyspepsia, especially when the lack of digestive enzymes, it is easy to appear after eating greasy food diarrhea symptoms; certain pancreatic diseases, liver and gallbladder diseases, such as chronic pancreatitis, cholecystitis and cholecystectomy, eating greasy cold food may also lead to diarrhea symptoms. Diarrhea after eating greasy food may also be related to other causes, such as irritable bowel syndrome, and it is recommended to consult a doctor to clarify the cause and provide targeted treatment.