Is there a particular diet that's good for polymyositis?

Polymyositis + Diet. You will find a lot of haturopathic diets claiming to be the best, but as an allopathic physician, i tend to base my decisions on science and research. A high protein diet might be of benefit. Attached is a link to a reputable medical website. http://emedicine.medscape.com/article/335925-treatment.