What are those about starches in food?

Starch is a natural polymer compound which is mainly found in the seeds or tubers of plants. Starch-rich foods often found in daily life include rice, wheat and potatoes. Here are three things you need to know about starch in food.
How is starch converted into energy in the body?
The primary form of starch in the daily diet is solid food such as steamed bread and rice. By chewing in the mouth, the solid food is broken down into small pieces and then passes through the esophagus into the stomach.
At this point the chemical form of starch begins to change, part of the starch is catalyzed by amylase in saliva, hydrolysis reaction occurs, generating maltose, but because of the limited amylase in saliva, some of the starch without the hydrolysis reaction will go from the stomach to the small intestine, and then in the pancreas secretion of amylase, continue to hydrolyze the role of. Starch is hydrolyzed to maltose, which is the second “transformation” of starch.
In the digestive process maltose will continue to be intestinal fluid secretion of maltase catalyzed by the hydrolysis of glucose can be absorbed by the human body, so glucose is the starch into the human body after digestion of the final form.
Part of the glucose enters the cell, after complex biochemical reactions, to produce energy, and directly supply to the human body tissues; the other part of the glucose as the raw material for the synthesis of glycogen.
Glycogen is mainly distributed in the liver and muscles of humans and animals, and is the energy storage material of humans and animals, which will decompose and produce glucose when the glucose in the blood of humans and animals is lower than the normal level, so as to replenish the needs in time.
What is resistant starch?
Resistant starch is a starch component that cannot be digested and absorbed by the upper gastrointestinal tract (stomach and small intestine) of the human body. Although it is a real starch in terms of its chemical structure, it cannot be broken down by the body into glucose, which is then absorbed into the bloodstream and used by the body as energy.
Resistant starch cannot be fully digested by the body and the food made from it contains less calorie value compared to normal starch. Can starch in food cause tooth decay?
The final form of starch is glucose, and starch itself is a sugar, so will we get tooth decay after eating starch-rich foods like rice buns?
According to research, during the process of chewing food, some food residues containing carbohydrates will remain on the surface of the teeth or in the crevices of the teeth, and the carbohydrate’s mainly include starch.
Starch, under the action of oral bacteria, fermentation produces acidic substances, which will form corrosion on human teeth, which are mainly composed of calcium carbonate and calcium phosphate.
In the long-term corrosion of acidic substances, the original smooth surface of the teeth will be decalcified and pits, and then some serious bacteria will be eroded to form “wormholes”, into cavities, so we eat food, we must remember to brush your teeth.