sentence: Unsaturated lipids have one or more double bonds.
sentences_before: Lipids are fats, and waxes. Saturated lipids contain single bonds, and are found in butter and lard.
sentences_after: 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: unsaturated lipid
headings: Biochemistry Macromolecules Lipids