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Lipid is the collective name for fats, oils, waxes and fat-like molecules (such as steroids) found in the body. protection, waterproofing, insulation and buoyancy agents. The basic unit of lipids is a triglyceride, synthesised from glycerol (propane-1,2,3-triol) and fatty acids. Glycerol is a type of alcohol. Alcohols are organic compounds. Their molecules are characterised by hydroxyl groups, -OH. Glycerol is a trihydric alcohol, which means each molecule has three hydroxyl groups.
A glycerol molecule can have up to three fatty acids attached, and the glycerol molecule of triglycerides contains the maximum of three fatty acids. Since fatty acids are hydrophobic -- water-hating -- molecules, triglycerides cannot dissolve in water.