# What Dark Green Poop Reveals About Your Digestion
Dark green stool usually signals one of three things: what you ate, how fast your food moved through your system, or a temporary shift in your gut bacteria.
Leafy greens like spinach and kale contain chlorophyll, the pigment that makes them green. When you consume large amounts, chlorophyll passes through your digestive tract and can tint your stool green. Foods artificially dyed green produce the same effect. These dietary causes are harmless and resolve within days of returning to normal eating patterns.
Speed matters in digestion. Bile, the yellowish-brown fluid your liver produces, breaks down fats and gives stool its typical brown color. When food rushes through your intestines too quickly, bile doesn't have enough time to fully break down, leaving stool green. This accelerated transit can happen from eating high-fiber foods, staying dehydrated, or experiencing stress-related digestive changes.
Antibiotics and iron supplements also trigger green stool. Antibiotics kill beneficial gut bacteria that help process bile, disrupting normal stool color. Iron supplements, commonly prescribed for anemia, absorb slowly and can appear green in the stool. Certain infections including Salmonella and Giardia speed up intestinal movement while simultaneously disrupting bacterial balance, producing green stools.
Green poop rarely requires medical attention. The color typically fades once you stop consuming culprits like leafy greens or complete a course of antibiotics. However, contact a healthcare provider if dark green stool persists for more than a few weeks, or if it accompanies severe stomach pain, persistent nausea, bloody stools, or chronic diarrhea. These combinations might indicate infections, inflammatory bowel disease, or malabsorption issues requiring evaluation.
Track what you eat and