Demi Lovato has been open about her experiences with addictions and eating disorders, as of late. For years Demi Lovato has suffered from an eating disorder (bulimia) and substance abuse issues. She's been trying to do better, as of recent. She's trying to overcome her addictions and lead a much healthier lifestyle. Living sober, eating healthier, exercising regularly, all the good things you do to make your body healthy.
However, she's recently learned that addictions can shift from one thing to the next. Even if something is good for you, it can become an addiction if you do not moderate.