It also agitates GERD/acid reflux, in people who have that problem.
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Ironically I have found that to be so. I tried drinking Green Tea and it upset my stomach far more than a good cup of coffee in the morning.
If I hold my coffee to two cups a day and drink both those before 3pm in the afternoon I usually don't have a problem with Gerd.
I also find that black coffee upsets my stomach " bigly"!! Use cream, and not a problem.