sentence: Lipids are fats, and waxes.
sentences_after: Saturated lipids contain single bonds, and are found in butter and lard. Unsaturated lipids have one or more double bonds. The human body stores lipids as an energy source. When the body needs a large amount of energy, lipid molecules are broken down to release that energy.
concept_name: lipid
headings: Biochemistry Macromolecules Lipids