Starting to help my wife's aunt. She has had GERD for years and taken a PPI for a long time. She is of of it now, but still has periodic GERD symptoms. She now has calcium deficeny along with osteoperosis. I was thinking on honing in on the gut health with her, fix that to allow for better nutrient absorption. Is GERD commonly a result of malfunctioning valve or something else? What is the best way to rebalance the stomach acid to a healthy point?