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bad fat, called "trans" fat, which acts like saturated fat in the body. Trans fat, which makes up 5 to 10 percent of the fat content in American diets, is a "hybrid" fat made by adding hydrogen atoms to a polyunsaturated fat to make it more saturated. Listed on food labels as hydrogenated or partially hydrogenated fat, it's found in most margarine, commercial baked goods, and deep-fried foods that use hardened vegetable oils.
Like saturated fat, trans fat should be avoided because it promotes the formation of cholesterol in the body.
The Fats to EnjoyIn Moderation
Unsaturated fats include monounsaturated fat and polyunsaturated fat. Monounsaturated fats are found in olive, peanut, and canola oils. Polyunsaturated fats are found in most other plant oils, including safflower, soybean, corn, sunflower, sesame, and cottonseed oils; fish oil; and oil from nuts, such as walnuts, hazelnuts, pecans, almonds, and peanuts.
Unsaturated fat is the kind you should eat because it's a great energy source, it contains essential fatty acids, and it actually lowers blood cholesterol levels.
How Much Fat Should You Eat?
In terms of your heart's health, the amount of trans fat and saturated fat you consume is more important than the total amount of fat in your diet. Health experts recommend substituting healthy unsaturated

 
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