Brown poop is normal and comes from a pigment called bilirubin. Green poop can happen from eating foods like spinach or due to gastrointestinal infections or severe diarrhea. Black, tarry poop can ...

You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. Epidemiologist Tim Spector has calculated — with some pretty impressive precision — how long it takes ...