Now, what about glycerol molecules? Where do we get glycerol molecules? Well, glycerol molecules are components of fats. More specifically, they're components of triglyceride. So that's the major type of fat molecule that exists in adipose tissue. And so when we actually need glucose in our body, when we can get the glucose from food, our fat cells, the adipose tissue cells, basically begin breaking down these triglycerides to form fatty acids and glycerol molecules.