Every one knows fat,but what is fat?May be most people don’t know.So what is fat and it has which functions.
Fat popular named lipin.It is according to origin separable animal and vegetable oil two broad headings.May divide into the fat according to the chemical constitution (also to call neutral fat) and the lipoid two kinds.Lipid, including phospholipids, glycolipids, steroids and steroid lipid categories.
Fat in the body play an important role in nutrition, the body’s total energy requirements of 10-40% is provided by fat.The primary function of fat is the supply of heat, the heat double than the same weight for protein and carbohydrates (sugars).In addition, it also provides the required “essential fatty acids” of body .Polyunsaturated fatty acids of linoleic acid, linolenic acid and arachidonic acid in the animal and the human body can not synthesis, must come from food, it is referred to as the “essential fatty acids”.They will produce a series of a lack of symptoms, such as growth retardation, dermatitis, etc.These fatty acids in soybean oil, corn oil, cottonseed oil, sesame oil, sunflower oil, peanut oil content of the highest.The main fatty subcutaneous tissue in the body awarded, the greater omentum, mesentery and kidneys, etc. around.Body fat content with nutritional status frequently, such factors as energy consumption and changes in.
To know what is fat you may be realize it’s funtions,and the main physiological functions of fat as follows:
1.Heat supply.Fat content of carbon and hydrogen and more than carbohydrates.Therefore, it can release more heat in oxidation.1 gram of fat can be released into the 9.3 kcal of energy, is the highest nutrient middle of a heat.
2.Constitute human tissues.Phospholipid in fat and cholesterol is the main component of human cells, brain cells and nerve cells in the most content.Some cholesterol is a steroid hormone the body to create the necessary material, such as adrenal hormones, sex hormones and etc.
3.The supply of essential fatty acids.Essential fatty acids required for human body is provided by the Food and fat.It is mainly used for phospholipids synthesis, is an important component of all cells in the structure ;to maintain normal microvascular permeability of the skin, as well as sperm formation, the synthesis of prostaglandins, such as the role of all the important functions of essential fatty acids.
4.Increase appetite, promote the absorption of some vitamins.Less fat or no fat food is not tasty, fatty food increase the flavor, but also promote some of the fat soluble vitamins A, D, E, K absorption and utilization.
5.Regulation of body temperature and protect the internal organs.Most of the storage of fat in the skin, for regulating the temperature, the protection of temperature-sensitive organizations, to prevent heat loss.Fat distribution to fill gaps in the internal organs can be from shock and mechanical damage and maintain the skin’s growth and development.
6.Increased sense of satiety.A more moderate fat digestion in the stomach to stay longer,increase the sense of satiety, hunger is not easy to find.
To measure the level of the nutritional value of fats there are two indicators:First, with the amount of unsaturated fatty acids;second, with the necessary amount of fat sticks.Of course, the vitamin content, digestibility of the high and low, storage performance, etc. should be fully taken into account.
Vegetable oils contained fatty acids and essential fatty acids than animal oil in both the high (very few exceptions).Because the source of dietary fat in addition to cooking, the oils and fats containing more than the rich from the animal food product, it is in the selection of appropriate cooking oil to vegetable oil-based, so that the proportion of suitable fatty acids.
Animal fats as a result of high heat, eat simple, unique flavor, if a balanced diet, proper deployment, and occasionally a small amount of food that should not be affected much.
In total,excessive intake of fats is one of the factors that the body fat!To know more of what is fat,you can carry out a search in google.com,good luck.
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