What part of human digestive system kill bacteria present in the food?

The part of the human digestive system that kills bacteria present in the food is the stomach. The stomach contains a highly acidic environment, with a pH of around 1-2, which is created by the secretion of hydrochloric acid. This acidic environment is lethal to most bacteria, and it helps to prevent them from causing infections in the body. In addition, the stomach also produces enzymes, such as pepsin, that help to break down proteins and further reduce the risk of bacterial growth.