What happens to starch during digestion?
Digestion of starch starts in the mouth. Ptyalin enzymes convert starch into sugar in the process of mastication and in-salivations. Secretions from saliva accompany food and salivary starch digestion continues in the stomach. This takes long time for food to digest if it is eaten in correct conditions. Ptyalin initiates the digestion of starch or body first gives the opportunity to ptyalin to initiate the digestion.
In the process of chewing, food and saliva mix together, but many people have the tendency of swallowing the food for enzymes to complete their action. This continues the action of saliva in the stomach. It should be noted that starches should not be moist while eating. They should be dry. Hence, potatoes should be steamed or baked rather than soup. Along with starch, people should drink lots of water to swallow starch which is moist.
Drink lots of liquids because liquidly food softens food artificially and makes people to eat more food than it is eaten dry. Drinking liquids during meals prevents thorough in-salivation and mastication of food. If ptyalin is inhibited or destroyed or starch digestion is interrupted, starch which is digested partially enters the duodenum. In duodenum, the starch is further digested. The starch that escapes from digestion, are later acted by intestinal and pancreatic enzymes. Interrupted gastric digestion is also possible.
Ptyalin needs neutral or alkaline medium. It can also be destroyed with mild acids also. If acids in fruits are eaten along with carbohydrates, digestion is prevented and fermentation occurs. One table spoon of vinegar containing acetic acid suspends digestion of saliva. While eating food with incompatible mixtures, and digestive enzymes efficiency is inhibited, food is decomposed in the digestive tract. If food is not broken down in the digestive enzymes, bacterial decomposition occurs and results in fermentation. Acetic acids and alcohol are the decomposition byproducts. Fermentation disintegrates food and puts in solution.