Understanding Fat In Your Diet

For decades, the mantra for healthy eating has been "eat a low-fat, low-cholesterol diet." Touted as a way to lose weight and prevent heart disease and other chronic conditions, millions of people have followed this advice. Seeing a tremendous marketing opportunity, food companies re-engineered thousands of foods to be low-fat or fat-free. The low-fat approach to eating may have made a difference for the occasional individual, but as a nation, it has nether helped us control our weight nor become healthier. In the 1960s, fats and oils supplied Americans with about 45 percent of their calories. About 13 percent of the population was obese and less than one percent had type 2 diabetes. Today, Americans take in less fat, getting about 33 percent of calories from fats and oils; yet 34 percent of the population is obese, and eight percent has diabetes (mostly type 2). (Source: Harvard School of Public Health).

Research has shown that the total amount of fat in your diet isn't linked with weight or disease. What actually matters is the type of fat in your diet. Trans fats and saturated fats increase your risk of cardiovascular disease, while monounsaturated and polyunsaturated fats do just the opposite. But then you ask, "what about cholesterol in food?" The answer is, for most people the mix of fats in their diets influences cholesterol in their bloodstreams far more than cholesterol in food.

Almost all foods contain some fat. Even foods like carrots and lettuce contain small amounts of fat. That's a testament to how important fats are for your health and well-being. Fat provides a terrific source of energy for your body as well as a great depot for storing it. It is an important part of cell membranes, helping govern what gets into and out of your cells. Your body uses cholesterol as the starting point to make estrogen, testosterone, vitamin D, and other vital compounds. Fats are also biologically active molecules that can influence how your muscles respond to insulin. Also, different types of fats can fire-up or cool down inflammation in your body.

Your body packages fat and cholesterol into tiny protein-covered particles called lipoproteins in order to get them into your blood stream. Some of these lipoproteins are big and fluffy, and others are small and dense. However, the most important ones to remember for your health and well-being are low-density lipoproteins, high-density lipoproteins, and triglycerides as explained below.

Low-density lipoproteins (LDL) carry cholesterol from your liver to the rest of your body. Your cells latch onto these particles and extract fat and cholesterol from them. When there is too much LDL cholesterol in your blood, these particles can form deposits in the walls of your coronary arteries and other arteries throughout your body. These deposits, called plaque can cause your arteries to narrow and limit blood flow, resulting in a heart attack or stroke. Thus, LDL cholesterol is called your bad cholesterol.

High-density lipoproteins (HDL) scavenge cholesterol from your bloodstream, your LDL, and your artery walls and ferry it back to your liver for disposal. Thus, HDL cholesterol is referred to as your good cholesterol.

Triglycerides comprise most of the fat that you eat and that travels through your bloodstream. Because triglycerides are your body's main vehicle for transporting fats to your cells, they are essential for good health. However, an excess of triglycerides can be unhealthy.