Providing energy, insulating body organs, and maintaining body temperature are functions of fats. They are also important in the maintenance of healthy hair and skin and encouraging healthy function of the cells. Also, they are responsible of carrying the fat soluble vitamins such as vitamins A, D and E for distribution to the cells.
Heat is then the by-product of the light energy from the Sun flowing through the biosphere. Organisms are inevitably dependent on sunlight to perform essential biological processes in order to sustain life. In the absence of this energy, all the organisms on Earth would die.