LIPIDS
Lipids contain the elements carbon, hydrogen and oxygen. They are insoluble in water but soluble in organic solvents (ethanol).
They provide twice as much energy as carbohydrates and supply the body with essential fatty acids. Vitamins are often found dissolved in lipids.
The most common type we eat and use as energy storage is triglycerides: made up of 3 fatty acids joined to 1 glycerol:
