The majority of fats are broken down in theAmouth.Bstomach.Csmall intestine.Dlarge intestine.

The majority of fats are broken down in the C. small intestine.

Here's a step-by-step explanation:

1. When you consume food, it first enters your mouth where it is mechanically broken down by your teeth and chemically broken down by enzymes in your saliva.

2. The food then travels down your esophagus and into your stomach, where it is further broken down by stomach acid.

3. The partially digested food, now a thick liquid, moves into the small intestine. Here, it is broken down even further by enzymes and bile. The bile, produced by the liver and stored in the gallbladder, is particularly important for fat digestion. It breaks down large fat droplets into smaller ones, a process called emulsification. This allows lipase, an enzyme produced by the pancreas, to effectively break down the fats into fatty acids and glycerol.

4. These smaller molecules can then be absorbed through the walls of the small intestine and into the bloodstream, where they can be used by the body.

5. Any undigested food material then moves into the large intestine, where water and electrolytes are absorbed. The remaining waste material is then excreted from the body.

So, while digestion begins in the mouth and continues in the stomach, the majority of fat digestion and absorption occurs in the small intestine.