These are large molecules which are formed from the union of many monosaccharides units through condensation. Excess glucose in the body is stored in form of glycogen and can be hydrolyzed when glucose levels go down. Glucagon stimulates liver cells to break down glycogen into glucose.
I think the answer is - when the body experiences a drop in temperature it forces the water molecules to move faster in order to break the hydrogen bonds and release energy as heat. hope this helps you.