A study produced by Washington State University looked into the effects of exercise and an antioxidant, gallic acid, on human cartilage cells. Gallic acid is found naturally in gallnuts, green tea, and various berries.
The combination of exercise and gallic acid was found to decrease arthritis inflammatory markers in cells, and improve the production of desired proteins normally found in healthy cartilage.
This research states that a healthy diet, high in antioxidants, and a little exercise appear to have positive effects for those suffering with early stages of osteoarthritis. Cartilage tissue needs to be gentle stressed through exercise, and reacts badly to total inactivity.