If I look at myself as an example, I would say, all the 5 night shade vegetables are a no no for osteoarthritis. I was looking online for a simple natural solution for osteoarthritis especially in my knees. I came upon the 21 day meal plan which alienates foods that cause inflammation in our bones. I like to be pain free and found when doing so, it helped a lot. However, I came across an article which mentioned that potato juice from raw potatoes is a great help to anyone that is dealing with any form of arthritis. There is plenty of information on the net on this form of potato nutrition. However, this theory counteracts the theory of the night shade family of vegetables, atleast in the instance of potatoes and arthritic pain, it seems.!!