ATP, or Adenosine Triphosphate, is like the energy currency for our body. When a cell in our body needs energy, it breaks down ATP, releasing energy. This energy is used for various activities, from helping us run and jump, to building new cells, to thinking and learning. In the case of fat cells, when they break down, they release fatty acids that can be used to make ATP. So, the energy stored in fat cells can be turned into ATP, which our body can use to power all its activities.