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Also known as fats Made of carbon, hydrogen, and oxygen When your body breaks down lipids, it turns it into fatty acids and glycerol Muscles use this as a source of energy 2 types: › Saturated › Unsaturated Your body uses this to make glucose (which is the body’s main source of fuel) Turns into body fat if not used Has lots of cholesterol Comes from animal products (meat, dairy, etc.) Is solid at room temperature Is the worse of the two for you to have Vegetable oils Is liquid at room temperature Is healthier for you to have Fats Phospholipids Waxes Steroids Made of glycerol & 3 fatty acids (triglyceride) Function: › Keeps animals warm, provides long-term energy, protects internal organs Constructed of a head and 2 tails Function: › Main part of a cell membrane Long chains of fatty acids linked to long chains of alcohols Function: › Repels water › Important in water-proofing 4 fused carbon rings Function: › Act as chemical signals estrogen / testosterone