I always had stomach aches and digestive problems. I started to realize that I would go into a food coma after eating things with wheat. I had eliminated wheat from my diet for several weeks and then ate something with a lot of wheat in it and literally fell asleep in the car on the drive home. (thankfully, i was a passenger, not the driver).
If you feel foggy after eating or are lacking energy or have a lot of digestive challenges, I highly recommend going gluten-free.