Resistant starch (resistant starch) is still starch itself, its chemical structure is different from fiber, but its properties are similar to soluble fiber. Resistant starch is indigestible and cannot be enzymatically cleaved in the small intestine, but it can be fermented with volatile fatty acids in the human gastrointestinal tract colon. Resistant starch exists in some natural foods, such as potatoes, bananas, rice, etc. contain resistant starch, especially high straight-chain starch corn starch containing resistant starch up to 60%. This starch is more difficult to degrade than other starches, digested slowly in the body, absorbed and enter the bloodstream more slowly. Its nature is similar to soluble fiber, which has a certain effect of reducing calorie intake and slowing down the rise of blood sugar. Recently, it is getting more and more attention. Advantages of resistant starch: 1, resistant starch can resist enzyme decomposition, slow release of glucose in the body, with a lower insulin response, can control blood glucose balance, reduce hunger, especially suitable for diabetic patients to eat; 2, resistant starch has the function of soluble edible fibers, can increase the amount of defecation, reduce constipation, reduce the risk of colon cancer; 3, resistant starch can reduce the amount of blood cholesterol and triglycerides, due to the consumption of resistant starch, can reduce the amount of blood cholesterol, and the amount of triglyceride, because of the consumption of resistant starch. Resistant starch can reduce the amount of blood cholesterol and triglyceride, because the amount of cholesterol and triglyceride in the excreta after eating resistant starch increases, so it has certain weight loss effect; For a long time people think that eating more starch-containing food will lead to obesity or cause the rapid rise of blood sugar. But resistant starch and ordinary starch is not very different, because of its special chemical structure makes more similar to the function of plant fiber. Resistant starch also has the effect of slowing down the rapid rise of blood sugar, so it is suitable for patients who control blood sugar.