What is one of the primary functions of lipids in cells?

Lipids play a crucial role in energy storage within cells. They are primarily composed of long hydrocarbon chains or fatty acids, which store energy in their chemical bonds. When the body requires energy, these stored lipids can be metabolized through various biochemical processes, providing a significant source of ATP (adenosine triphosphate), the energy currency of cells. This energy-dense characteristic makes lipids an efficient form of energy storage compared to carbohydrates.

While lipids also have other important functions, such as forming structural components of cell membranes and aiding in hormone production, their role as stored energy is fundamental, particularly during periods of fasting or extended physical activity when quick access to energy becomes vital for cellular processes.