Do Fat Cells Ever Really Go Away?

The video explains how aerobic exercise boosts metabolism by using stored fat as energy. Fat cells, or adipocytes, are crucial for energy storage and body structure. They grow or shrink based on weight changes but never disappear. Fat is stored as triglycerides, which release energy when broken down. Losing weight involves expending energy to break down these triglycerides, but it's challenging as fat is easily regained. The video highlights the importance of fat cells in energy management and body function.

Explain the process of how fat is used for energy in the body.

Why is it easier to gain back weight after losing it?