Fat is insoluble in water, so it cannot be carried around the body. Therefore it is transferred to the blood in tiny droplets called lipo proteins. Lipo consists of, triglyceride, cholesterol and phospholipids and protein. There are two types of lipo proteins, firstly high density lipo proteins which have a LOW triglyceride content. Low levels increase the likelihood of cornorary heart disease, so therefore high lelvels help PROTECT against CHD.
The second type are called low density lipo proteins. They have a HIGH triglyceride content and HIGH levels INCREASE CHD.