Why does acid and food mix in the stomach chemical digestion?

In the stomach, food mixes with gastric acid, primarily hydrochloric acid, which creates a highly acidic environment. This acidity helps denature proteins, making them easier for digestive enzymes, like pepsin, to break them down into smaller peptides. Additionally, the acidic environment also helps kill harmful bacteria that may be ingested with food, contributing to the overall digestive process and protecting the body from infection.