i have been trying to do it all with diet and i can control diarhea, but not inflammation. The definition of remission differs somewhat and may be hard to verify at all by your doctor.
from 4 years experiance and no drugs, in a severe case like mine, its impossible to get a full remission, but you can reduce diarhea quite a bit.
i should have tried more drugs. right now, im weeks away from doing a fecal transplant, and still not pursuing drugs. although i do take some lialda which helps a bit but also makes my joint pain come back.