why do we need fat in our bodies

Not all fats are bad (Also see ); you just need to know the difference between fats you need, and fats you don t need. Here are some of the top reasons why you need fats:
Gram for gram fats are the most efficient source of food energy. Each gram of fat provides nine calories of energy for the body, compared with four calories per gram of carbohydrates and proteins. Fats are a vital part of the membrane that surrounds each cell of the body. Without a healthy cell membrane, the rest of the cell couldn t function. You need fats because provides the structural components not only of cell membranes in the brain, but also of myelin, the fatty insulating sheath that surrounds each nerve fiber, enabling it to carry messages faster.

Vitamins A, D, E, and K are fat-soluble vitamins, meaning that the fat in foods helps the intestines absorb these vitamins into the body. Fats are structural components of some of the most important substances in the body, including prostaglandins, hormone-like substances that regulate many of the body s functions. You need fats because they regulate the production of sex hormones, which explains why some teenage girls who are too lean experience delayed pubertal development and amenorrhea.

One of the more obvious signs of fatty acid deficiency is dry, flaky skin. In addition to giving skin its rounded appeal, the layer of fat just beneath the skin (called subcutaneous fat) acts as the body s own insulation to help regulate body temperature. Lean people tend to be more sensitive to cold; obese people tend to be more sensitive to warm weather. Many of the vital organs, especially the kidneys, heart, and intestines are cushioned by fat that helps protect them from injury and hold them in place. (True, some of us overprotect our bodies. ) As a tribute to the body s own protective wisdom, this protective fat is the last to be used up when the body s energy reserves are being tapped into.

A healthy body needs some fat, which contains essential nutrients. Your body uses dietary fat to make tissue and manufacture biochemicals, such as hormones. Fats in your diet are sources of energy that add flavor to food the sizzle on the steak, you can say. However, fats may also be hazardous to your health. The trick is separating the good from the bad. The chemical family name for fats and related compounds such as cholesterol is lipids. Liquid fats are called oils ; solid fats are called, well, fat.

With the exception of cholesterol, fats are high-energy nutrients. Gram for gram, fats have more than twice as much energy potential (calories) as protein and carbohydrates (affectionately referred to as carbs): 9 calories per fat gram versus 4 calories per gram for proteins and carbs. Some of the body fat made from food fat is visible. Even though your skin covers it, you can see the fat in the adipose (fatty) tissue in female breasts, hips, thighs, buttocks, and belly or male abdomen and shoulders. This visible body fat Cushions your skin (imagine sitting in your chair for a while as you enjoy your visit to Dummies. com without your buttocks to pillow your bones) Other body fat is invisible.

You can t see this body fat because it s tucked away in and around your internal organs. This hidden fat is A component of myelin, the fatty material that sheathes nerve cells and makes it possible for them to fire the electrical messages that enable you to think, see, speak, move, and perform the multitude of tasks natural to a living body; brain tissue also is rich in fat A constituent of hormones and other biochemicals, such as vitamin D and bile