Demi Lovato has been to hell and back - and star of 18 years, Disney, finally ready to tell his story.In a new interview with Seventeen (via RadarOnline), Sonny with a chance to finally opens to an eating disorder "for life", which forced her into rehab in November last year."I do not think there will be a day when I do not think the food or my body", Lovato admits, "but I live with it, and I