1. Triglycerides: These are the most common type of fat found in food. They are composed of glycerol (a sugar alcohol) and three fatty acid molecules. Triglycerides are the primary energy storage form in the body.

2. Phospholipids: These are similar to triglycerides but have a phosphate group attached to one of the glycerol molecules. Phospholipids are essential components of cell membranes and play a role in signaling and transport.

3. Sterols: These are complex lipid molecules that have a ring structure. Cholesterol is the most well-known sterol and is found in animal products. Sterols are important components of cell membranes and are precursors to hormones like testosterone and estrogen.