Lipid Metabolism: The Breakdown and Synthesis of Fats

Lipids serve multiple functions in the body, including energy storage, as structural components of cell membranes, and as precursors for hormone production.

Triglycerides are the main form of fat stored in adipose tissue. They are composed of three fatty acids attached to a glycerol molecule.

Lipolysis is the process by which lipids are broken down into fatty acids and glycerol. This process occurs when the body needs energy and cannot obtain it from carbohydrates or proteins.

Epinephrine is a hormone that is released in response to stress or exercise. It stimulates lipolysis, causing the release of fatty acids from adipose tissue into the bloodstream.

Lipogenesis is the process by which fatty acids are synthesized from acetyl-CoA. This process occurs in the liver and adipose tissue when there is an excess of carbohydrates or proteins in the diet.

Acetyl-CoA carboxylase is the enzyme that catalyzes the first step of lipogenesis, which is the conversion of acetyl-CoA to malonyl-CoA.

Phosphatidate phosphatase is the enzyme that catalyzes the final step of lipogenesis, which is the conversion of phosphatidate to diacylglycerol.

Oleic acid is a type of fatty acid that is unsaturated, meaning that it has one or more double bonds between the carbon atoms.

Palmitic acid is a type of fatty acid that is saturated, meaning that it has no double bonds between the carbon atoms.

A triglyceride is a molecule that is formed when a fatty acid is esterified with glycerol. Triglycerides are the main form of fat stored in adipose tissue.

Phospholipids are a type of lipid that is found in cell membranes. They are composed of a glycerol molecule, two fatty acids, and a phosphate group.

A phospholipid is a molecule that is formed when a fatty acid is esterified with a phosphate group. Phospholipids are a major component of cell membranes.

Steroids are a type of lipid that is found in hormones. They are composed of four fused carbon rings.

A steroid is a molecule that is formed when a fatty acid is esterified with a cholesterol molecule. Steroids are a major component of cell membranes and are also involved in hormone production.

Bile acids are a type of lipid that is found in bile. They are synthesized from cholesterol in the liver and help to emulsify fats in the small intestine.