WHAT IS FAT?
Fat is a highly valuable substance which exists in some form in many plants, seeds and animals. In plants and seeds, it is mainly stored in the form of oils. In humans and animals it’s stored in body tissue known as adipose tissue, which is made up of many fat cells or adipocytes. The main types of fats in plants and animals are called triglycerides. The main function of the fat cell is as a storage reserve of these triglycerides for energy, but it also has secondary functions of providing a ‘cushion’ or protection for the organs of the body and insulating against heat loss. Before it gets into the fat cell, fat in the bloodstream also acts as a transport medium for fat-soluble vitamins such as vitamins A, D, E and K.
While triglycerides are the main type of fat used by the body, two other fats, cholesterol and phospholipids, also have important functions. Cholesterol is a waxy fat-like substance which is used for the production of certain substances such as sex hormones, and in the structure of cell membranes (cell lining). The phospholipids make up part of the structure of every cell, particularly the cell membrane. In our diet, almost all of the fat is in the form of triglycerides with only a small amount of cholesterol and phospholipids.
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