What can alter the pH of a human stomach?

Water - Water doesn't affect the pH of the stomach, but it does serve to provide enough liquidity that food, enzymes, and acids can readily mix together. Some enzymes require water in order to function. Mucous - Mucous (or mucus) is produced by cells in the mouth. esophagus, and stomach. read more

Milk of magnesia . Its is recommended by doctors when someone have an acidity problem. read more

The pH of your stomach varies, from 1-2 up to 4-5. When you eat, the stomach releases enzymes called proteases as well as hydrochloric acid to aid in digestion. By itself, the acid doesn't really do much for digestion, but the proteases that cleave proteins work best in an acidic environment or low pH, so after a high-protein meal, your stomach pH may drop to as low as 1 or 2. read more