Weight and osteoarthritis of the knee
Evidence shows that being overweight increases the strain on your joints – especially your knees. Being overweight not only increases your risk of developing osteoarthritis but also makes it more likely that your arthritis will get worse over time.
Because of the way your joints work, the force put through your knees when you walk, especially on stairs and slopes, can be several times your actual body weight. Losing even a small amount of weight can make a big difference to the strain on your weight-bearing joints.
No special diet has been shown to help with osteoarthritis, but if you need to lose some weight we would recommend a balanced, reduced-calorie diet combined with regular exercise.