I used to get heart burn all the time as a kid. At one point during my mission in Italy I realized that I hadn't had heartburn in almost 2 years.
The week I got home, I ate Arby's and had what seemed like the worst heartburn of my life.
Also, while you can still get fat because you eat too much European bread, it definitely sits way better. There is definitely something to the genetically modified flour that doesn't feel right.