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Cholesterol is a waxy, fat-like substance (lipid). The body needs it for the functioning of the cell membranes, the insulation of nerves, and the production of certain hormones. The liver uses it to make bile that aids in digestion. There are two types: dietary and blood

Dietary cholesterol is found only in animal products, such as meat and dairy. Blood cholesterol is produced by the liver and from the foods you eat. Your liver makes about 80 percent of your blood cholesterol, and about 20 percent comes from your daily food intake.

In order for cholesterol to be carried in the blood, your body coats the cholesterol with proteins, resulting in a combination of substances called lipoproteins. Low-density lipoproteins (LDL) contain lots of cholesterol. High-density lipoproteins (HDL) contain
mostly protein. HDL is called good cholesterol because it sweeps away cholesterol deposits from artery walls. High levels of HDL lower the risk of heart disease.

Regular exercise produces a more favorable ratio of HDL to total blood cholesterol. Aerobic activity in general and Tune-Up particular can increase HDL. It can also help to lower blood triglycerides, a type of dietary fat that increases the risk of coronary heart disease.

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