I've noticed that I get heartburn very late at night, even though I don't suffer during the day. Yesterday, having skipped lunch, I found that I didn't get heartburn. The key difference was the omission of one meal's worth of processed carbohydrates. Today I had a wrap for lunch. Although I don't have heartburn I can feel the effect of the carbs.
Hubby likes a low fat diet for weight loss. I did some checking and there does seem to be a link between carbs and heartburn, so I'm planning to do a low carb, reduced fat diet. I'll still eat plenty of vegetables, but I'll reduce the amount of bread products that I eat every day.