The part of the human body that produces bile is the liver. Bile is a digestive fluid that aids in the emulsification of fats, making them easier to digest and absorb in the small intestine. The liver continuously produces bile, which is then stored in the gallbladder until it is needed during digestion. When food, particularly fatty food, enters the small intestine, the gallbladder releases bile to help break down the fats. Additionally, bile contains substances that help eliminate waste products from the body, showcasing the liver's vital role in digestion and metabolism.