By fibro do you mean fibromyalgia
To my knowledge, research has not been done to definitively answer this question, but i recommend an all organic diet to everyone & vegetarian diets
have many proven benefits.
I do advise an anti-inflammatory diet, which is primarily vegetarian but can include
wild salmon/sardines/other healthy fish: http://www.Drweil.Com/drw/u/art02012/anti-inflammatory-diet.