Green poop can result from several common and usually harmless causes, as well as some medical conditions:

• Dietary causes: Eating large amounts of green leafy vegetables (like spinach, kale, broccoli) or foods with green or blue artificial coloring can turn stool green due to chlorophyll or food dyes

• Rapid transit through intestines: If food moves too quickly through the large intestine, such as with diarrhea, bile (which is naturally greenish) doesn't have time to break down completely, causing green stool

• Medications and supplements: Antibiotics, iron supplements, bismuth subsalicylate (Pepto-Bismol), and some antacids can alter gut bacteria or pigment breakdown, resulting in green stool

• Infections: Bacterial infections (e.g., Salmonella, E. coli), viral infections (norovirus), and parasites (Giardia) can cause green stool by speeding intestinal transit or altering gut flora

• Other medical conditions: Some gastrointestinal disorders like Crohn’s disease, celiac disease, or bile acid malabsorption can cause green stool due to changes in bile processing or intestinal inflammation

Generally, green stool is not a cause for concern if you feel well and have no other symptoms. However, if green stool persists, is accompanied by diarrhea, abdominal pain, fever, weight loss, or bleeding, medical evaluation is advised

. In summary, green poop often means either dietary factors or faster-than- normal intestinal transit affecting bile breakdown, but it can occasionally signal infections or GI conditions that may need attention