This is from Dr. McDougall's website.
http://www.drmcdougall.com/med_hot_arthritis.htmlPainful joints can be divided into "degenerative" and "inflammatory" forms of arthritis. Osteoarthritis is the name often given to the degenerative form and this kind is helped with weight loss, a change in diet, glucosamine, and acupuncture. Inflammatory forms of arthritis, like rheumatoid, Lupus, psoriatic, and ankylosing spondylitis are very responsive to the McDougall Program. To be more specific, about 70% of people with the most common form of inflammatory arthritis, rheumatoid arthritis, can expect dramatic benefits, and often a cure, in less than 4 weeks of diet change. The diet must be followed strictly – medications are reduced and stopped as improvements occur.