I'm the total opposite ... Have had super high-acid stomach all my life. It leaches through my skin and makes white clothing turn yellow within three wearings. Consequently, taking apple cider vinegar, even in tiny doses, feels like I've consumed acid. Fortunately, I don't do antacids except in emergencies. I find that just chewing on a head of endive solves the problem

Like Sue said, I think it's high time that all docs stop making assumptions and just do a little testing, first, then go from there.