What is the main purpose of bile?

• A. To digest carbohydrates
• B. To absorb vitamins
• C. To emulsify fats
• D. To neutralise stomach acid

Answer: (C)

Bile’s job in digestion is to emulsify fats. It’s made by the liver and stored in the gallbladder, then released into the small intestine when fat reaches the gut. The bile salts act like detergents, breaking large fat droplets into many tiny ones. This increases the surface area for pancreatic lipase to work, making fat digestion much more efficient. The result is smaller fatty acids and monoglycerides that can form micelles for easy absorption by the intestinal lining, which also helps the body take up fat-soluble vitamins. Bile doesn’t digest carbohydrates—that’s the job of amylase—and it doesn’t neutralise stomach acid; that neutralisation is handled by bicarbonate from the pancreas and other stomach–duodenum processes. Emulsifying fats is the key function here.