Now, there are many different types of sugar molecules, but the major sugar molecule that we use inside our body is glucose. Now, where does glucose, and then generally, where do sugar molecules actually come from? Well, sugar molecules are produced by plants. And plants basically capture that energy that is stored in light that comes from the sun and it transforms that energy into the chemical bonds within the sugar molecule. So what happens is in the sun we have all these different nuclear reactions which take place and produce they release energy. And that energy is then stored in electromagnetic waves which propagate through space.