The fats in foods are derived from the structural and storage fats of animals and plants

With few exceptions, all food originates from living matter therefore the lipids in the diet of humans are the structural and storage lipids of animals and plants. Animal storage fats (mainly triacylglycerols with some dissolved cholesterol and fat-soluble vitamins) are present in meat that retains parts of the adipose tissue. Lard, for example, is a cooking fat derived from the adipose tissue of the pig. Milk fat occurs in full fat milk, cheese, cream, full fat yoghurt, butter and low fat...

Components of the immune system and their functional assessment

It is well established that diet has an important influence on immunity. Energy malnutrition and deficiencies in specific nutrients result in increased susceptibility to infection and increased mortality, especially in children. Lipids may be involved in immunity in several ways. The role of some glycosphingolipids in cell-surface antigens is discussed later in Section 4.4.2. The following deals only with the contributions of dietary lipids. Because of their importance as a source of dietary...

The Integration And Control Of Animal Acylglycerol Metabolism

Metabolisme Lipid

The major function of TAG in animals is as a source of fatty acids to be used as metabolic fuel. A full description of the overall fuel economy of the body requires an understanding of the metabolism storage, transport, synthesis, oxidation of the fatty acids as well as of the integration of fat and carbohydrate metabolism. interconversion of different types of fuels is hormonally regulated to maintain blood glucose concentration within the normal range and ensure storage of excess dietary...

Diseases Involving Changes Or Defects In Lipid Metabolism

Muscle Biochemistry

Defects in a variety of lipid metabolic pathways can give rise to inappropriately high or sometimes low concentrations of lipoproteins in the blood. This in turn may Fig. 5.16 The acylation stimulating protein ASP system in adipose tissue. Arrival of a chylomicron particle in the capillary sends a signal to the adipocyte probably by transfer of a protein carried by the chylomicron to a specific receptor on the adipocyte surface , which increases secretion of the three proteins D, B and C3,...

The monoacylglycerol pathway is important mainly in rebuilding TAG from absorbed dietary fat

The main function of the monoacylglycerol pathway Fig. 3.6 is to resynthesize TAG from the monoacylglycerols formed during the digestion of fats in the small intestine. Therefore, this mechanism is one by which existing TAG are modified rather than one by which new fat is formed Section 5.1.3 . During the hydrolysis of dietary TAG in the intestinal lumen by pancreatic lipase, the fatty acids in positions 1 and 3 are preferentially removed. The remaining 2-monoacylglycerols are relatively...

A few dietary lipids may be toxic

Much of the discussion in this chapier is concerned with the positive contributions made by dietary lipids, especially fatty acids, to nutrition and health. It is equally important to consider whether dietary lipids can also have adverse or toxic effects. Of the fatty acids, those containing a cyclopropene ring Section 2.1.4 have been considered toxic as a result of their ability to inhibit the A9-desaturase. One result of this is to alter membrane permeability as seen in 'pink-white disease'....