After colloidal alginic acid enters the digestive system, it wraps a part of cholesterol and other lipids, so that this part of fat cannot be absorbed by the gastrointestinal tract. Secondly, people digest and absorb fat by their own bile acids. The more bile acids, the more fat is absorbed. Some bile acids will be reabsorbed and reused by the intestinal wall after decomposing fat. The colloid of alginic acid permeates the intestinal wall, which can prevent the reabsorption of some bile acids and reduce the amount of bile acids in the digestive tract, thus reducing the fat absorption rate. However, the fat reduction work of alginic acid is not over yet. When the amount of bile acid in the digestive system is insufficient, the human body will automatically send a signal to drive the liver to produce new bile acid to supplement it, and the raw material for producing bile acid is cholesterol in the liver.

In addition, seaweed can not only reduce the absorption of fat, but also contain rich minerals such as iron, copper, calcium and magnesium, vitamins and various amino acids necessary for human body. So eating more seaweed to lose weight can also avoid malnutrition.

Another important function of seaweed is to maintain normal blood pressure. An important cause of abnormal blood pressure is the imbalance of trace elements sodium and potassium in human body. Because people eat salt every day, sodium will continue to enter the human body, but potassium supplement may not be sufficient and timely. So many people are often in an unbalanced state of low potassium and high sodium. Alginic acid in seaweed is actually a colloidal mixture, which is coated with metal ions such as potassium, calcium and magnesium.

After alginic acid enters the intestine, because the intestine is alkaline, it is necessary to find the combination of metal ions, and people eat salt every day, and sodium ions are the most in the intestine, so alginic acid combines with sodium ions in large quantities and is firmly wrapped until it is excreted. Seaweed supplements potassium and excludes sodium in this way, so that potassium and sodium tend to be balanced in the human body.

Seaweed can lose weight because it contains alginic acid.