The most important mechanism by which HDL exerts its antiatherogenic role is the removal of excess cholesterol from peripheral cells and its transport to the liver, a process commonly termed the reverse cholesterol transport system (RCT). Several proteins are involved in this process, including ATP-binding cassette transporter 1, LCAT, CETP, and hepatic triglyceride lipase (see Pathophysiology). 
Population studies have shown that low levels of HDL cholesterol—less than 40 mg/dL for men and less than 50 mg/dL for women—increase the overall risk of coronary artery disease (CAD) and heart attacks. A person whose HDL level is lower than 35 mg/dL has eight times the risk of CAD as someone with an HDL level of 65 mg/dL. Experts have long thought that boosting HDL levels promotes heart health. But while low HDL is a strong and well-established risk factor for heart disease, the evidence for raising HDL remains uncertain. But experts agree that taking these heart healthy steps are still worthwhile.
One drawback of going on a low-fat diet for some people is that it lowers HDL levels. If raising your HDL cholesterol is a primary concern, you should replace carbohydrates in your diet with fats, preferably mono- and polyunsaturated fats. But avoid trans fat, which can lower HDL levels. These steps can lower both total cholesterol and LDL and maintain HDL or boost it slightly, improving the ratio of total cholesterol to HDL.
In randomly screened children aged 6-19 years who had age-, race-, and sex-specific total plasma cholesterol levels greater than or equal to 95th percentile levels, 7.8% of white males, 12.8% of white females, 25% of black males, and 17.2% of black females had hypercholesterolemia due to elevated high-density lipoprotein [HDL] cholesterol levels (but not due to elevated low-density lipoprotein [LDL] cholesterol levels) greater than age-, sex-, and race-specific 95th percentile levels. That is, they had HALP.
While cholesterol is normally kept in balance, an unhealthy diet high in hydrogenated fats and refined carbohydrates can disrupt this delicate balance, leading to increased cholesterol levels. This imbalance is manifested in elevated LDL (bad cholesterol) and low HDL (good cholesterol), which increases the risk of heart attack or stroke. Other causes can include physical inactivity, diabetes, stress and hypothyroidism.
Many people don't like to hear it, but regular aerobic exercise (any exercise, such as walking, jogging or bike riding, that raises your heart rate for 20 to 30 minutes at a time) may be the most effective way to increase HDL levels. Recent evidence suggests that the duration of exercise, rather than the intensity, is the more important factor in raising HDL cholesterol. But any aerobic exercise helps.
Trans fats are a byproduct of the chemical reaction that turns liquid vegetable oil into solid margarine or shortening and that prevents liquid vegetable oils from turning rancid. These fats have no nutritional value — and we know for certain they are bad for heart health. Trans fats increase LDL cholesterol and triglyceride levels while reducing levels of HDL cholesterol.
Research shows that there isn't really a link between how much fat you eat and your risk of disease. The biggest influence on your risk is the type of fat you eat. Two unhealthy fats, including saturated and trans fats, increase the amount of cholesterol in your blood cholesterol and increase your risk of developing heart disease. However, two very different types of fat — monounsaturated and polyunsaturated fats — do just the opposite. In fact, research shows that cutting back on saturated fat and replacing it with mono and polyunsaturated fats can help lower the level of LDL cholesterol in your blood.
Of course, shifting to a cholesterol-lowering diet takes more attention than popping a daily statin. It means expanding the variety of foods you usually put in your shopping cart and getting used to new textures and flavors. But it's a "natural" way to lower cholesterol, and it avoids the risk of muscle problems and other side effects that plague some people who take statins.
While this belief is still thought to be almost always true, in recent years a fly has been found in the ointment. Drug companies have spent billions of dollars developing drugs that increase HDL cholesterol levels. However, to the dismay of all, these drugs have failed to reduce cardiac risk—despite the fact that they make HDL levels go up. Development of at least two of these drugs has now been halted. (More on this below.) So the HDL story is more complex than scientists originally had hoped.
115 my triglycerides being 456 and my HDL cholesterol that I 35 and then my LDL direct is 256 my family is known for heart disease and plaque buildup nine really don’t want that to happen so any advice would be appreciated I already limit my diet really well with vegetables and fruits and I eat a lot of pork and chicken and I’m allergic to fish so I can eat fish is there anything I can do to replace that thank you for your time have a wonderful day