Uh, that link was not what I thought it was. It is interesting. My advice would be to eat a diet rich in fruits and vegetables and lean meats. Easy on carbs - make them healthy ones that are complex. Pretty much like a diabetic would eat. That will decrease weight and help reduce inflammation and pain.
Any extra weight will cause arthritis and the pain it causes to be worse.
http://www.heartfeltfoods.com/alkaline-diet/