Main enzyme involved in digestion of fatty food?
The core concept here is the digestion of dietary fats. In the human body, fats are broken down by lipases. The primary site for fat digestion is the small intestine, but the process starts in the stomach. The stomach has gastric lipase, but it's not the main one. The main enzyme is pancreatic lipase, which is secreted by the pancreas into the duodenum. Bile from the liver emulsifies fats, increasing the surface area for lipase to act. Pancreatic lipase breaks down triglycerides into monoglycerides and free fatty acids.
So the correct answer is likely pancreatic lipase. Now, the wrong options might include things like amylase (which digests carbs), pepsin (protein digestion in stomach), or bile (which is a detergent, not an enzyme). Let me check the possible options. Suppose the options are A. Amylase, B. Pepsin, C. Bile, D. Pancreatic lipase. Then D is correct.
Why are the others wrong? Amylase is for carbohydrates. Pepsin is a protease. Bile is produced by the liver and stored in the gallbladder, it emulsifies fats but isn't an enzyme. Clinical pearl: Pancreatic insufficiency (like in cystic fibrosis) leads to fat malabsorption because of lack of lipase. So the high-yield fact is that pancreatic lipase is key for fat digestion. The correct answer is D. Pancreatic lipase.
**Core Concept**
Fat digestion primarily occurs in the small intestine via **lipases**, with **pancreatic lipase** being the principal enzyme responsible for breaking down triglycerides into monoglycerides and free fatty acids. Bile salts from the liver emulsify fats, facilitating lipase action.
**Why the Correct Answer is Right**
**Pancreatic lipase** is secreted by the pancreas into the duodenum. It hydrolyzes the 1- and 2-positions of triglycerides, producing monoglycerides and free fatty acids. This enzyme requires colipase to bind to the lipid-water interface, enhancing its activity. It is the primary enzyme for dietary fat digestion, accounting for >90% of fat breakdown.
**Why Each Wrong Option is Incorrect**
**Option A: Amylase** – Digests carbohydrates, not fats.
**Option B: Pepsin** – A protease active in the stomach for protein digestion.
**Option C: Bile** – Emulsifies fats but is not an enzyme; it increases surface area for lipase action.
**Clinical Pearl / High-Yield Fact**
Pancreatic insufficiency (e.g., in cystic fibrosis) causes steatorrhea due to impaired lipase activity. Remember: **"Lipase = fats, amylase = carbs, proteases = proteins."**
**Correct Answer: D. Pancreatic lipase**