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Ah, the good old digestive system! So fascinating, yet so gross. You may have learned in school about bacteria, tiny living things in the large intestine which help to turn the food we eat into solid waste. Your liver also plays a part, producing a fluid called bile to break down fats. Originally, bile is a yellowish-green colour, but once it travels through your digestive system it turns brown, which is the normal colour of poop.
So poop mainly gets its colour from bile. Did you know that your diet can also affect the colour of your poop? That's right, what you eat could turn your poop into different colours! For example, if you eat too much spinach, your poop can turn green. Ew! But that's no excuse for not eating your vegetables.