Having been diagnosed with MS and Fibro for many years with PAIN being one of my major symptoms, I have noticed a relationship between it and foods. One of the main culprits is Chinese food. I love it and still eat it once-in-while, but then prepare to be more achey than usual for the next day of two.
I do think many of our ailments today are caused by so many chemicals we take into our bodies every day of our lives. We humans have totally made a mess out of our beautiful world.