Why does a meat chewed for minutes still contains the same protein as when it was first bitten off?

When meat is chewed, the physical act of chewing breaks down the food into smaller pieces, increasing its surface area. However, the chemical composition of the meat, including its proteins, remains unchanged during the chewing process. The proteins in the meat are not broken down by chewing; instead, they are broken down by enzymes in the stomach and small intestine during the process of digestion. Therefore, the protein content of the meat remains the same from the moment it is first bitten off until it is fully digested.