For me it wasn't when or how much but what. At it's worst I was taking prescription medicine ate what I thought was healthy food (whole grain bread, oat cereal) and still had heartburn every night. I am not celiac but eliminating beer, whole grain wheat, and oats got rid of my acid reflux. Wheat, especially the modern variety, is not well tolerated by humans http://news.discovery.com/human/why-you-should-probably-stop.... If you can't give up bread eat Sourdough http://cookusinterruptus.com/blog/?p=4245