It works in the stomach, specifically in the acidic environment of the stomach.

Here's a breakdown:

* Chief cells are specialized cells in the stomach lining responsible for producing pepsinogen (a precursor to pepsin, a digestive enzyme) and gastric lipase.

* Gastric lipase is an enzyme that breaks down triglycerides (fats) into fatty acids and glycerol.

* The acidic environment of the stomach, created by hydrochloric acid, is essential for gastric lipase to function effectively.

While the stomach is the primary site of gastric lipase action, it is important to note that pancreatic lipase is the primary enzyme responsible for fat digestion in the small intestine. Gastric lipase plays a more minor role, particularly in infants where it's more active.