Coffee has a pH level of about 5 while our gastric acid boasts a pH of about 2, making the latter more acidic. As a result, our stomachs should be able to handle the acid that drinking coffee causes.
Anything you eat causes the production of gastric acid, but coffee [produces] more of it. So if you feel bloated or are dealing with upper abdominal pain and nausea after drinking coffee on an empty stomach, you know you are having some issues with it.
It's not necessarily that too much acidity is a problem, because the stomach can handle it... It's more about your esophagus not being able to withstand that kind of acid damage.
Drinking coffee on an empty stomach increases the production of gastric acid. Higher levels of the fluid don't cause any problems for many people but may lead to discomfort in some others.
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