What is the primary effect of bile on lipid digestion?

What is the primary effect of bile on lipid digestion?

• A. Increases surface area by emulsifying fats to aid lipase.
• B. Hydrolyzes triglycerides directly.
• C. Neutralizes stomach acid to permit lipase.
• D. Inhibits lipase to limit digestion.

Answer: (A)

Bile emulsifies fats, increasing their surface area so pancreatic lipase can work more efficiently. Bile salts are amphipathic; they coat large fat droplets and break them into many small droplets. This creates far more surface for the lipase enzyme to act on triglycerides, speeding their digestion into monoglycerides and fatty acids. Bile also helps form mixed micelles to keep the digestion products soluble for absorption, but the key point is the emulsification that boosts lipase access. It doesn’t directly hydrolyze triglycerides, neutralize stomach acid, or inhibit lipase.

Bile emulsifies fats, increasing their surface area so pancreatic lipase can work more efficiently. Bile salts are amphipathic; they coat large fat droplets and break them into many small droplets. This creates far more surface for the lipase enzyme to act on triglycerides, speeding their digestion into monoglycerides and fatty acids. Bile also helps form mixed micelles to keep the digestion products soluble for absorption, but the key point is the emulsification that boosts lipase access. It doesn’t directly hydrolyze triglycerides, neutralize stomach acid, or inhibit lipase.