Congratulations on slowly losing weight! This is a very important health initiative and will serve you well in the long run.
As you know osteoarthritis
is simply 'wear and tear' arthritis, caused by cartilage deterioration over time. It does tend to worsen as you age, but there are a few things you can do to help.
The first, and most important thing, is weight loss
which you are already doing. This is because osteoarthritis tends to affect some of the big weight bearing joints, especially the hips and knees. Therefore, the 'wear and tear' on these joints is directly related to your weight, and you can relieve a lot of the pressure on them simply by doing this.
The second is exercise. Regular exercise (in addition to its helpful effects on weight) also improves muscle strength and overall joint flexibility. These will serve you well in the long term and keep your level of fitness up for as long as possible.
There are many dietary supplements and changes that are popular for osteoarthritis, including chondroitin or glucosamine supplements and diets high in antioxidants. None of these have been proven to make a difference, although they do help some people and are not harmful. Talk to your doctor
if you have further questions.