If you use the artificial sweetener aspartame, you may find the case studies at the following link, informative:
http://www.ncbi.nlm.nih.gov/pubmed/21176433The removal of aspartame was followed by a complete regression of pain, without recurrence. We believe that these patients' chronic pain was due to the ingestion of aspartame, a potent flavouring agent, widely used in food as a calorie-saver. The benefit/ risk ratio of considering the diagnosis of aspartame-induced chronic pain is obvious: the potential benefit is to cure a disabling chronic disease, to spare numerous laboratory and imaging investigations, and to avoid potentially harmful therapies; the potential risk is to temporarily change the patient's diet. Thus, practitioners should ask patients suffering from fibromyalgia about their intake of aspartame. In some cases, this simple question might lead to the resolution of a disabling chronic disease.
Since there is no proof, (nor even any credible evidence), that aspartame has any health benefits, (it's not food), there is nothing to lose by eliminating it from the diet - nothing to lose other than the symptoms of fibromyalgia, that is.
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