Quoted By:
Eat long grain brown rice, veggie stir fry. Eat 2 tablespoons of hempseed per day and chai seeds if you want a cheaper option.
As for exercise, try a rowing machine. Never tried it so it may be too much for your knees. I imagine it as more of a chest workout primarily. Just a suggestion.
Also, look into glucosamine and chondroiton fr your joints.