The term hyperlipidemia not otherwise specified, or NOS, refers to a condition in which the patient has too many fats in the blood, or hyperlipidemia, but does not meet the clinical criteria for a more specific type of hyperlipidemia. The most common type of hyperlipidemia is due to high cholesterol or triglycerides, according to the American Heart Association. Doctors use the acronym "NOS" when making a general, nonspecific diagnosis of a particular medical condition, explains Wikipedia.
In many cases, a patient with hyperlipidemia has too much of the bad type of cholesterol, or LDL, and not enough of the good type, or HDL, explains the American Heart Association. This can cause a buildup of plaque that blocks the arteries, leading to heart disease or stroke. HDL cholesterol helps remove LDL from the arteries, slowing the development of plaque. Hyperlipidemia may be the result of a poor diet or genetics.
Eating a healthy diet and exercising regularly can help improve the health of patients with hyperlipidemia, advises the American Heart Association. These patients should eat foods with low cholesterol and low trans fats and limit the amount of red meat and whole-milk dairy products in their diets. They should avoid fried foods and use unsaturated oils when cooking. Weight loss and eating more high-fiber foods can help reduce a person's cholesterol level.