When it comes to cholesterol, not all types are created equal, and it is important to understand how lifestyle choices significantly impact cardiovascular health. High-density lipoprotein, or HDL, is known as the “healthy” or “good” type of cholesterol due to the fact that it scavenges and removes the “bad” type of cholesterol (low-density lipoprotein or LDL) known to clog arteries. A desirable HDL level is anything greater than 60 milligrams per deciliter (mg/dL).

An easy way to make the switch from trans fats is by replacing them with unsaturated fats, which don’t increase your LDL cholesterol, according to WebMD. Unsaturated fats are found in olive oil, canola oil, vegetable and sunflower oils, as well as fish, nuts, seeds and avocados. Just as unsaturated fats are healthy choices, unsaturated fats are not. Be sure to limit your intake of unsaturated fats, which are found in fatty meats, cold cuts, whole milk, whole-milk cheeses and many store-bought baked goods and snacks. Instead, enjoy lean cuts of meat, skim milk, low-fat cheeses and yogurt, and wholesome snacks to trim down your cholesterol levels. 

What is the difference between HDL and LDL cholesterol? The body needs cholesterol, but too much bad cholesterol can be harmful and is a major risk factor for heart disease and stroke. In this article, learn about the difference between HDL and LDL — “good” and “bad” — cholesterol, as well as how they are measured. What steps can you take to lower LDL and increase HDL? Read now

HDL particles are heterogeneous. They can be classified as a larger, less dense HDL2 or a smaller, denser HDL3. [16] Normally, most of the plasma HDL is found in HDL3. [17] To add to the complexity of HDL classification, HDL is composed of 4 apolipoproteins per particle. HDL may be composed of apo A-I and apo A-II or of apo A-I alone. HDL2 is usually made up only of apo A-I, while HDL3 contains a combination of apo A-I and apo A-II. HDL particles that are less dense than HDL2 are rich in apo E.
Fish can be fatty or lean, but it’s still low in saturated fat. Eat at least 8 ounces of non-fried fish each week, which may be divided over two 3.5- to 4-ounce servings. Choose oily fish such as salmon, trout and herring, which are high in omega-3 fatty acids. Prepare fish baked, broiled, grilled or boiled rather than breaded and fried, and without added salt, saturated fat or trans fat. Non-fried fish and shellfish, such as shrimp, crab and lobster, are low in saturated fat and are a healthy alternative to many cuts of meat and poultry.
Who doesn't love avocados? They not only taste amazing but also can help lower your cholesterol. Avocados are high in healthy monounsaturated fat, which helps lower "bad" LDL cholesterol. They also contain fiber, antioxidants and phytosterols, such as beta-sitosterol, which have also been shown to lower cholesterol. Don't hog the entire bowl of guacamole, though! One serving is just a quarter of a Hass avocado, which delivers 57 calories. Spread a few slices of avocado on your sandwich instead of mayo, or dip some veggies into a bowl of fresh guacamole.
However, although low levels of HDL predict increased cardiovascular risk, particularly in healthy individuals with no history of cardiovascular events, the relationship between HDL and CHD risk is complex, with HDL-C and cardiovascular disease having a nonlinear relationship. For example, research found that HDL levels above approximately 60 mg/dL showed no further improvement in prognosis, and the EPIC (European Prospective Investigation into Cancer and Nutrition)-Norfolk and IDEAL (Incremental Decrease in End Points through Aggressive Lipid Lowering) studies showed that very high levels of HDL may actually be associated with an increased risk of atherosclerotic disease. [5, 6, 2]
Nuts are high in polyunsaturated fatty acids, so almonds, walnuts, or pistachios can help reduce your LDL levels. Try sprinkling them on your salad, or eat them right out of hand as a snack. Just be sure to choose the low-salt option, and keep it to about 1.5 ounces a day -- nuts are also high in calories. For almonds, that’s about 30 almonds or 1/3 cup.
Once you know your cholesterol levels, it’s time to discuss a plan with your doctor. Although changing your lifestyle to include a heart-healthy diet and plenty of exercise is usually the first step to lower cholesterol, some types of cholesterol problems like familial hypercholesterolemia may require medication right away. Work with your doctor to come up with the best cholesterol goals for you and the best ways to get there.
Cholesterol is then returned to the liver by multiple routes. In the first route, cholesterol esters may be transferred from HDL to the apo B–containing lipoproteins, such as very–low-density lipoprotein (VLDL) or intermediate-density lipoprotein (IDL), by CETP. These lipoproteins undergo metabolism and subsequent uptake by the liver, primarily by a process mediated by the B,E receptor. In the second route, HDL particles may be taken up directly by the liver. In the third, free cholesterol may be taken up directly by the liver. Finally, HDL cholesterol esters may be selectively taken up via the scavenger receptor SR-B1.
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.

You've probably heard that fried foods of all kinds, hydrogenated oils, and full-fat dairy products are cholesterol bombs that are best avoided (and not just by those watching their cholesterol levels). The American Heart Association recommends that everyone restrict these foods, as they contain trans and saturated fats, the "bad" kind that raises LDL cholesterol and leads to plaque buildup in the arteries.