MSG

MSG-Mono Sodium Glutamate is a chemical that stimulated part of your taste buds to make food taste savory. I know that MSG is not a product of wheat, but my wife and I do not react well to MSG. It is in almost every thing that you think tastes good or is processed, Ranch dressing - Chinese food.
With out getting to graphic my wife and I went to Chili's and both ordered ribs off their Wheat free Menu, Their ribs were mediocre at best, but both of us had a upset stomach at the same time and same reaction.
I had thought for the longest time that going out to eat meant that food would taste good but cause me to feel bad in a half hour. I used to joke about McDonalds having a negative calorie menu because it was never in my body long enough to process, I did not realize that it was just me.

Once I recognized it was MSG, I did a couple tests eat "X" with MSG added, and "X" without if pretty much realized that both my wife and I are intolerant of MSG and therefore most commercial chain restaurants.

So No Wheat and No MSG, Fried Food and ranch are gone but.. their are better foods that taste great without those things.