Some people are exquisitely sensitive to the theobromines in chocolate and experience heartburn after eating only a small amount of chocolate. Dry cocoa powder and unsweetened Baker’s chocolate contain the greatest amounts of theobromine followed by dark chocolate. Milk chocolate contains less, and white chocolate only has tiny amounts. You may be able to eat white chocolate without triggering heartburn symptoms, although white chocolate is high in fat, which can cause heartburn too. Of course, white chocolate lacks the health benefits that makes dark chocolate such a healthy treat.