What is the role of bile acids in fat digestion?

• A. Act as emulsifiers
• B. Neutralize stomach acid
• C. Are enzymes that hydrolyze triglycerides
• D. Support absorption of sugars

Answer: (D)

Bile acids act as detergents in the small intestine, emulsifying dietary fats to create many small droplets and thus dramatically increasing the surface area available for pancreatic lipase to act. After emulsification, they form mixed micelles with fatty acids and monoglycerides, cholesterol, and fat-soluble vitamins, solubilizing these lipids so they can be taken up by enterocytes. This process is essential for fat digestion and absorption; bile acids are not enzymes and do not neutralize stomach acid or aid in sugar absorption, which relies on different transport mechanisms.