Lipids are the masters of energy storage, and some have important structural roles or serve as hormones, among other things. You may be most familiar with lipids as fat, but every one of the cells in your body has a membrane, or layer, of lipids that protects it from its environment. So don't diss lipids too much. They do not solely strive to pack pounds onto that gorgeous frame of yours.
Lipids are an eclectic bunch of biomolecules, but all are hydrophobic and therefore do not dissolve in water.
There are three kinds of lipids, and each one has a different function:
The first group of lipids includes fats, oils, and waxes. Slippery. They are composed exclusively of carbon, hydrogen, and oxygen, or CHO, and usually do not roll into little rings like the monosaccharides we talked about earlier. The monomer, so to speak, is a fatty acid. Your cell membranes are made of lipids.
Fats and oils store a ton of energy. They store over twice as much energy as carbs or proteins. Fats are clearly a more efficient way to keep energy for long-term use.
Lipids are found in fatty foods like butter and oils.
Via Ellen Lynch