Fat and Calories

Fat is the body’s major energy storage system. When the energy from the food you eat and drink can’t be used by your body, the body may turn it into fat for later use. Your body uses fat from foods for energy, to cushion organs and bones, and to make hormones and regulate blood pressure. Some fat is also necessary to maintain healthy skin, hair and nails, so you shouldn’t cut all fat out of your diet. But in general, most people in the United States consume too much fat – which can lead to heart disease, obesity, diabetes and many other health problems.Types of Fats
Not all fats are created equal. Saturated fats, which are generally solid at room temperature, are the least healthy and tend to increase the level of cholesterol in your blood. Foods that contain saturated fat include butter, cheese, some margarines, shortening, tropical oils such as coconut and palm oil and the fats in meat and poultry skin, so you should try to limit your consumption of those oils and foods.

Unsaturated fats reduce blood cholesterol when they replace saturated fats in the diet. There are two types of unsaturated fat - monounsaturated fat and polyunsaturated fat. Monounsaturated fats have been shown to raise the level of HDL, the 'good' cholesterol that protects against heart attacks, in the blood, so in moderation they can be part of a healthy diet. Olive and canola oils, peanut butter and nuts are particularly high in monounsaturated fats. The American Heart Association (AHA) recommends that you limit calories from monounsaturated fat to no more than 15% of your total calorie intake.

Although polyunsaturated fats come from plants and fish, but they may be more likely to form free radicals and lead to tissue damage. Good sources of polyunsaturated fats include most other vegetable oils and high-fat fish such as salmon and tuna. The AHA also recommends that saturated and polyunsaturated fats should make up less than 10 percent of your calorie intake.

Partially hydrogenated vegetable oils, such as those used in many margarines and shortenings, contain unsaturated fats called trans-fatty acids. Trans-fatty acids may raise blood cholesterol levels, although not as much as saturated fat.