Fats are primarily energy matter which is entered through diet using foods of plant and animal origin. They are the bearers of vitamins A, D, E and K, are also constitutive role because constitute 2% of each cell. Fat with sugar constitute the cheapest source of energy, because 1g fat is burning 9 kcal (twice the amount of protein and carbohydrates).
Fatty acids can be classified as saturated and unsaturated.
The first type are saturated fats, which are mainly found in meat, eggs, dairy products, including butter, cheese … much better and healthier type of diet are unsaturated fats. These are healthy fats and are divided into two groups: monounsaturated and polyunsaturated.
Monounsaturated fats are found in olive oil, walnuts, canola oil …
Polyunsaturated fats are found in some vegetable oils and fish oil. These are:
a) Omega 6 linoleic acid. The role of the LOOK of the proper growth of the organism, has them in sunflower, corn and sesame oil.
b) Omega 3 linoleic acid. The role is reflected in the structure and function of cell membranes. There is oil from flax seeds, pumpkin seeds, and fish oil: salmon, tuna, sardines, herring, mackerel. It can not be created in the body, but must be entered by food. A derivative of omega-3 plays an important role in brain development and function of vision.
Omega 3 fats are especially important because it raises levels of good HDL cholesterol and reduce levels of bad LDL, and are also important for brain development. Act favorably on the health of the heart and blood vessels, and intake of fish two to four times a week and regular use of olive oil contribute to reducing the risk of cardiovascular disease.
It is recommended that the ratio of saturated and unsaturated fats in the diet is 10: 30%
Fat containing phosphorus called phospholipids. They are added to foods as an additive, usually in margarine, chocolate, frozen sweets. Since cholesterol is the most important that are more than 90% located in the membrane of cells and is required for synthesis of vitamin D in the skin, and then to the synthesis of certain hormones (estrogen and testosterone). Drugs such as steroids anabolics belong to the group of sterols (used in sports to increase muscle mass and strength but they are very dangerous because it can damage the liver).
The overall fat intake should cover less than 30% of daily energy needs. The origin should be primarily from grains, fruits and vegetables, which are rich in fiber and micronutrients. A person with abnormal lipid whose cholesterol levels remain increased must apply the reduction of daily fat intake to only 20% and 7% saturated.