The brown color of poop comes from the bile that is added by the liver to your bowl of cereal as it makes its way through the small intestine. The bile is changed by bacteria from green to brown.

Much of the food you eat is absorbed by your digestive system, which includes your stomach and your intestines.

Muscle contractions and relaxations in your digestive system, also known as peristalsis, make your body move food through your colon.

Coffee can increase your urge to poop, especially if you drink it in the morning. This is partly due to coffee's effect on muscle contractions in the gut.

While this is a popular selling point for colon cleanses, there isn’t scientific evidence to back up the theory that your poop can poison your body if you aren’t pooping daily.

In addition, certain health conditions can make you more likely to react to the ingredients in protein products, says Eric Yoon, MD, a gastroenterologist at Manhattan Gastroenterology.