Lipids Metabolism: Chemistry and Classification

An enzyme present in saliva that initiates lipid digestion.

Lipids are classified into three groups: simple, compound, and derived. This categorization helps understand their diverse structures and properties.

Lipids act as an insulator, preventing heat loss from the body. They contribute to maintaining body temperature by providing a layer of insulation, particularly under the skin.

Fat-soluble vitamins, including A, D, E, and K, are associated with lipids. They are absorbed alongside lipids, requiring the presence of bile for efficient absorption.

Simple lipids are esters formed by the reaction of fatty acids with alcohol like glycerol. These are the basic building blocks of many complex lipids.

Lipid digestion begins in the mouth with the action of lingual lipase, an enzyme present in saliva.

The liver is not directly involved in lipid digestion. It plays a crucial role in processing and storing fats, but the primary digestion happens elsewhere.

Fat-soluble vitamins are associated with lipids. They need fat present for absorption in the body.

Waxes are a type of lipid formed by esters of fatty acids, but with alcohols higher than glycerol. They are commonly found in nature, providing protection and waterproofing.