Learn something new on Instagram: "Why Your Poop Changes Color: The Rainbow Poop Guide . . Stool color reflects bile, transit time, and foods. Brown is normal; green often follows rapid transit or leafy greens; yellow suggests fat malabsorption; black may indicate upper GI bleeding or iron; red can be beets—or lower GI bleeding; pale/clay hints bile duct issues. Solutions: review recent foods, meds (iron, bismuth), and symptoms. Hydrate, increase fiber for regularity, and monitor for pain or fev