Regardless of what you might have read on various health-related web sites, there is no evidence-based, one-size-fits-all, anti-fibromyalgia diet. Food may be in the mix, but no one knows for sure where it fits. "Part of the problem is that fibromyalgia is a complex group of symptoms, and the symptoms are not the same for everyone," says Andrea Dunn, RD, LD, CDE, a Cleveland Clinic dietitian. "Treatment may differ with each individual." Fibromyalgia is not a form of arthritis and does not cause inflammation or damage to joints, muscles, or other tissues. But like arthritis, it can cause enough pain and fatigue to interfere with a persons ability to carry on daily activities.