Amanda, I would encourage you to start cooking. It's so much easier to control what goes into your body. While I haven't done a challenge, or have eliminated huge categories of food like wheat and dairy, I just don't buy pre-packaged foods, like Weight Watcher's dinners, or anything. I have never been a soda drinker, since my teens. My parents always served water with meals. Any desserts we had were home made.
I read labels and tend to spend the $ if a product I need for cooking is free of chemicals. I always say it's cheaper in the long run, than taking medication!
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport