I gave up gluten (withdrawal symptoms), high fructose foods (digestive issues, celiacs wrecks your small intestine lining), caffeine (withdrawal symptoms), sodium nitrites (withdrawal symptoms, but I don't know much about this one, it's in bacon and deli meats as a preservative / cure), and now sugar (withdrawal symptoms). I feel so good. My nose used to be stuffy all the time, I used to have awful digestion, cutting out these foods totally changed my life.
I'm honestly really grateful that I'm celiac, I think it magnifies all the shittiness that these foods bring. It got me to realize all the garbage I was sustaining myself on. I'm now incredibly healthy despite being 'sick'. One of the stranger realizations was that I now only drink water, and that I used to live mostly off of soda.
All these industries have huge interests in selling people addicting food (caffeine, sugar) and maintaining their market positions. They put out so much misinformation on what is healthy.