So what that basically means is when we run out of these two storages of energy, our body will begin to break down the triglycerides to form the high energy ATP molecules. And that will last us several weeks. And after we run out of our triglyceride storages, that's when our body begins to actually break down the protein, the muscles of our body, for energy. Now, the question is, what makes triglycerides so special? Why is it that our cells actually choose to store the predominant amount of energy within our fat molecules, the triglycerides, and not within, for instance, the glycogen? Well, these two properties make glyceroaldehyde such a highly concentrated storage of energy.