A diet high in
saturated fat or
cholesterol can directly raise cholesterol levels.
However, not all saturated fat has the same effect on raising cholesterol. Fat
found in tropical oils, such as coconut and palm kernel oil, has the greatest
effect on raising cholesterol. Check the ingredients on the labels of your
foods to determine whether a processed food contains tropical oils.
Trans fatty acids or partially hydrogenated vegetable oils, such as
those found in hard margarines, snack crackers, cookies, chips, and
shortenings, may also increase cholesterol levels. Hydrogenation is a process
that makes the fat solid or semi-solid.
Monounsaturated and polyunsaturated fats, such as those found in olive, canola,
safflower, and peanut oils, may improve cholesterol levels when they are
substituted for saturated fat and trans fatty acids.
Although only about 20% of cholesterol comes directly from the diet
(the other 80% is produced by the liver), a diet high in cholesterol and some
saturated fats can cause the liver to produce more LDL ("bad")
cholesterol.
Each person's body processes cholesterol differently. How much a
person's diet influences his or her cholesterol levels varies from person to
person and is probably determined by inherited characteristics. Some people who
eat high-cholesterol diets have very high cholesterol levels; others may have
normal or low levels.