Hi Daniela and welcome - I have been able to eliminate inflamation in my sacrum by following the NSD. I then went one step further by eliminating all sugars (dairy, fruit, etc), which ended up eliminating the pain and stiffness in the neck and shoulders, which turned out to be due to fungus/Candida.
Keep a food journal, and test all your foods with iodine in the beginning. I now feel best when I stick to M.O.V.E. (Meats/fish, Oils - coconut, butter, Vegetables and Eggs.)