As I sought to rejigger my body during several earlier moments of confusion over the past decade, I sought out programs like the Goop Cleanse (early one with good food) as well as the Clean program to clean up my eating. Both include limiting your food to food that causes limited reactivity.
I noticed a tremendous difference with both programs enough to repeat them later.
While I always enjoyed cooking fresh food, the programs forced me to reconsider again packaged food. Trust me that one you start reading the back of packages, well yah you probably will not want to eat so much packaged stuff.