Acid reflux/indigestion/heartburn can all be caused by drinking diet fizzy drinks, they're one of the number one causes... Although admittedly; so can eating a lot of citrus fruit, and the obvious candidates such as alcohol and fried food.
My take it that anything like that is going to be bad if you drink litres of it every day,
What else can cause heartburn? I dont have any of the foods that you listed that much but I keep getting it
