The process of digestion of fats in the human body, what is the final product of fat digestion in th

Digestion and absorption of dietary fats:

The digestion of fat is mainly in the small intestine, and although the stomach also contains a small amount of lipase (an enzyme that digests fat), the stomach is an acidic environment, which is not conducive to fat emulsification (making fat emulsify), and can only play an emulsifying role, so it is generally believed that fat is not easy to digest in the stomach. After the fat reaches the small intestine, pancreatic lipase (an enzyme secreted by the pancreas to digest fat) and bile breaks down triglycerides into diglycerides and 1 molecule of free fatty acids. Fats must be broken down into fatty acids and triglycerides before they can be absorbed by the small intestine.

The digestion and absorption of fats can be affected by certain factors. For example, fats with more unsaturated fatty acids are more easily absorbed than fats with more saturated fatty acids; Fatty acids with more unsaturated double bonds are more digestible than those with low content. In addition, the digestion and absorption rate of fat is also related to the level of its melting point, and the digestibility of fats with a melting point of more than 50 is low.

All in all, the more double bonds and unsaturated fatty acids a fat contains, the lower the melting point, and the higher its digestion and absorption rate.

Most fats and fats can be fully absorbed and utilized, but when you eat a lot of fatty or oily foods, the fat will not have time to digest, the absorption will be slowed down, and some of it will be excreted in the stool. Experiments have proved that soybean oil, corn oil, cream and lard and other oils and fats can be completely digested by the human body within 6 8 hours, and the digestion and absorption in 2 hours is the highest, up to 24 41, 4 hours is 53 71, 6 hours is 68 85, and 8 hours is 85 96

The end product of fat digestion is: fatty acids.

Fatty acids are absorbed into the bloodstream by small intestinal epithelial cells and bound to serum lipoproteins to be transported to tissue cells for use.

Fat is broken down into fatty acids, cholesterol and other fat digestion products in the small intestine by the action of various enzymes and bile salts, and is usually absorbed into the bloodstream through the wall of the small intestine

1. Triglycerides composed of medium-chain and short-chain fatty acids can be absorbed after emulsification and enter the blood through the portal vein;

2. Triglycerides composed of long-chain fatty acids combine with apolipoproteins, cholesterol, etc. to form chylomicrons, and finally enter the blood through lymph.

Fat metabolism is an important and complex biochemical reaction in the body, which refers to the process of digestion, absorption, synthesis and decomposition of fat in the body with the help of various related enzymes, and processed into substances required by the body to ensure the operation of normal physiological functions, which is of great significance for life activities.

The salivary gland is located in the oral cavity and can secrete saliva, which contains salivary amylase, which can preliminarily digest starch and preliminarily digest starch into maltose The digestion of protein starts from the stomach, when the protein in the food enters the stomach, it enters the small intestine after preliminary digestion under the action of gastric juice, and the pancreatic juice and intestinal fluid in the small intestine contain enzymes that digest proteins, and under the action of these enzymes, proteins are thoroughly digested into amino acids; The digestion of fat begins in the small intestine, the pancreatic juice and intestinal fluid in the small intestine contain enzymes to digest fat, at the same time, the bile secreted by the liver also enters the small intestine, although bile does not contain digestive enzymes, but bile has an emulsifying effect on fat, which can promote the digestion of fat, and fat is completely decomposed into glycerol and fatty acids under the action of these digestive juices

Physiological functions of fat in the human body.