The food you eat contains different nutrients such as carbohydrates, proteins, fats, and other substances.
Some carbohydrates, such as starch, start to be digested in the mouth with the help of enzymes in the saliva.
What happens to the food in the stomach?
The stomach is made up of smooth muscles. As the muscles move, they churn the food into a thick liquid.
The stomach lining produces substances called gastric juices which aid in digetion. They contain hydrochloric acid. The acid kills germs in the food and also makes the conditions ideal for the enzymes in the stomach to act. Some enzymes break down carbohydrates and proteins. But proteins are not fully digested in the stomach. Undigested fats and proteins go to the small intestine where digestion continues.