# What Your Dark Green Poop Is Actually Telling You
Dark green stool usually traces back to diet or digestive speed, not disease. Leafy greens like spinach and kale contain chlorophyll, the pigment that gives plants their color. When you consume large amounts of these vegetables, chlorophyll passes through your digestive system and can tint your stool green. Foods with artificial green dyes produce the same effect.
The timing of digestion matters too. Bile breaks down fats and gives stool its typical brown color. When food moves through your intestines too quickly, bile doesn't have enough time to fully process the waste. This accelerated transit leaves stool green instead of brown.
Several medical factors can also shift stool color. Antibiotics disrupt your gut bacteria, which affects how your digestive system processes food. Iron supplements create similar changes. Infections like Salmonella and Giardia speed up intestinal movement, leaving less time for bile to work. These infections typically come with additional symptoms.
Green poop becomes a reason to contact your doctor if it persists beyond a few days or arrives with severe stomach pain, nausea, or persistent diarrhea. These combinations suggest infection or digestive problems that need professional evaluation. A healthcare provider can test stool samples and assess your symptoms to determine whether you're dealing with a benign dietary cause or something requiring treatment.
Most cases of green stool resolve on their own. If leafy greens triggered the change, your stool returns to brown once you moderate your intake. If antibiotics caused it, normal stool color typically returns after you finish the medication and your gut bacteria rebalance. Temporary changes in stool color are normal and rarely indicate serious illness, but persistent changes paired with other symptoms warrant medical attention.