The Science Of Obesity: Fats & Cholesterol
Posted by Nick Niesen on October 26th, 2010
For years we heard that a low-fat, low-cholesterol diet would keep us healthy and help us lose weight.
And many of us jumped on the bandwagon, eliminating fat and high-cholesterol foods from our diets. Well, unfortunately, we were doing it all wrong.
Before we examine the good fats and bad fats, let?s talk about cholesterol.
Cholesterol - It?s been ingrained into our brains that cholesterol causes heart disease and that we should limit our intake of foods that contain it, but dietary cholesterol is different than blood cholesterol.
Cholesterol comes from two places?first, from food such as meat, eggs, and seafood, and second, from our body. Our liver makes this waxy substance and links it to carrier proteins called lipoproteins.
These lipoproteins dissolve the cholesterol in blood and carry it to all parts of your body. Our body needs cholesterol to help form cell membranes, some hormones, and Vitamin D.
Well, high-density lipoproteins (HDL) carry cholesterol from the blood to the liver. The liver processes the cholesterol for elimination from the body. If there?s HDL in the blood, then less cholesterol will be deposited in the coronary arteries. That?s why it?s called ?good? cholesterol.
That means that our heart won?t get the oxygen and nutrients it needs, which could result in heart attack, stroke, or sudden death. So, if your LDL is higher than your HDL, you?re at a greater risk for developing heart disease.
It?s the types of fats you eat that affect your blood cholesterol levels.
There are two fats that you should limit your intake of?saturated and trans fats.
Saturated fats are mostly animal fats. You find them in meat, whole-milk products, poultry skin, and egg yolks. Coconut oil also has a high amount of saturated fat. Saturated fats raise both the good and bad blood cholesterol.
Trans fats are produced through hydrogenation?heating oils in the presence of oxygen. Many products contain trans fats because the fats help them maintain a longer shelf life. Margarine also contains a high amount of trans fats.
Trans fats are especially dangerous because they lower the good cholesterol, HDL and raise the bad cholesterol, LDL. Unfortunately, most products do not tell you how much trans fat it contains, but you can find out if it?s in a product by looking at the ingredient list.
If the ingredients contain hydrogenated or partially-hydrogenated oils, then it contains trans fats. Fortunately in 2006, manufacturers will be required to list the amount of trans fat in their products on the nutrition labels, so it will be easier for you to find.
Some fats actually improve cholesterol levels.
Polyunsaturated fats are found in sunflower, corn, and soybean oils. These oils contain Omega-6, an essential fatty acid. However, most people get enough Omega-6 in their diet and instead need more Omega-3. Omega-3 is a fatty acid found in fish and walnuts.
Monounsaturated fats are found in canola, peanut, and olive oils.
About the AuthorNick Niesen
Joined: April 29th, 2015
Articles Posted: 33,848
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