When you say “extra acid” could you elaborate just a bit? Have you ever had ulcers, or been diagnosed with reflux? Any meds ever taken for it? Is it painful, or just noisy?
In college (1970s) my diet consisted of black coffee, Jack Daniels, cigarettes, macaroni & cheese, and hot dogs. I was diagnosed with an ulcer. Eventually I cut out the Jack Daniels and, years later, cigarettes. Reflux eased a bit, but never really went away.
Today, I still thrive on my (1 mug) of morning black coffee and don’t eat anything until early afternoon. But since going keto 2+ years ago the acid reflux, which was getting a bit worse in recent years (waking up in the middle of the night with urge to purge), suddenly disappeared in 2-3 weeks. Gone. I’m convinced it was the carbs (perhaps in combination with the other junk, but removing the carbs did the trick).
So I’m wondering in your situation what exactly you mean by “extra acid” and how it feels since going keto vs. prior?
[BTW, welcome to the forum!]