Lipids are storage compounds, triglycerides serve as reserve energy of the body.
Lipids are important component of cell membranes structure in eukaryotic cells.
Lipids regulate membrane permeability.
They serve as source for fat soluble vitamins like A, D, E, K.
They act electrical insulators to the nerve fibres, where the myelin sheath contains lipids.
Lipids are components of some enzyme systems.