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Good question.The stomach pH level is maintained at around 4. When we eat food and drink water, especially alkaline water, the pH level inside the stomach goes up. When this happens, there is a feedback mechanism in our stomach to detect this that commands the stomach wall to secrete more hydrochloric acid into the stomach to bring the pH level back to 4. So the stomach becomes acidic again. When we drink more alkaline water, more hydrochloric acid is secreted to maintain the stomach pH first hcl is secreted and followed by water
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