"Awesome. I used to feel incredibly lousy after every meal and couldn't identify why since I'm habitually a healthy eater. Even unsuspecting healthy foods can lead to an overabundance of stomach acid and cause discomfort! Looks like no more ICE drinks at lunch for me."
There are many causes of heartburn: foods and drinks, eating behaviour, medications, pregnancy and exercising. Here you can read in-depth information about common triggers: http://relieveacidreflux.com/causes-of-heartburn/