When polyunsaturated fatty acids are partially hydrogenated one or more of the double bonds not saturated alters its normal cis configuration to a trans configuration - rotating the position of the H atom to the other side of the carbon. The body seems to recognize this new structure as a saturated fat despite its double bond in the carbon chain. Phospholipids Phospholipids - are similar to triglycerides except the third fatty acid has choline and and phosphate group. Sterols Sterols are multi-ring structures found in plant and animal products. Cholesterol is a major sterol important in human nutrition.
Cholesterol is a waxy substance produced by the liver and found in foods of animal origin.
New research has shown that some plant sterols may interfere with cholesterol absorption and thus reduce serum cholesterol levels. Of all the energy components, lipids take the longest to digest. Meals high in fat prior to training or competition may cause intestinal discomfort. The majority of lipid digestion occurs in the small intestine. Cholecystokinin stimulates the gallbladder to release bile into the small intestine.