Lipoprotein carriers transport lipids through the bloodstream. Chylomicrons are formed in the Choose...intestinal tractlivergallbladderpancreas. They eventually reach the bloodstream through the Choose...pulmonary arteryjugular veinsportal veinrenal artery in the neck. As they travel through the bloodstream they gradually give up triglycerides to capillary walls. Lipoprotein lipase breaks them down. After Choose...36810 hours little is left of the chylomicron except cholesterol-rich remnants.

HDL are scavenger lipoproteins, picking up excess Choose...LDLcholesterolwhite blood cellshydrogen molecules released by dying cells and arterial plaques. These plaques are created by LDL degrading over a long period of time. Choose...EnterocytesChylomicronsWhite blood cellsRed blood cells that have embedded themselves in arterial walls damaged by smoking or diabetes have scavenger receptors which bind to LDL and cause it to release its cholesterol. If HDL levels are low there is an increased risk for atherosclerotic heart disease.

The Daily Value on food labels recommend consuming Choose...30 grams45 grams65 grams80 grams of fat based on a 2000 kcalorie diet. To fulfill the need for omega –6 fatty acids, linoleic acid should provide 2% of our calories.

When protein is used as part of a fat substitute, the product cannot be used in cooking because high temperatures cause denaturation. Many products use carbohydrates as fat replacements and bind Choose...waterlinoleic acidamino acidsalcohol to further dilute calories. Olestra is a very controversial fat substitute. Because olestra is not absorbed it may cause symptoms of fat malabsorption such as Choose...sweatingconstipationdiarrheafrequent urination.