There are two types of arthritis: rheumatoid arthritis (an autoimmune disease, like type 1 diabetes), and osteoarthritis (a degenerative disease, like type 2 diabetes). Every source I’ve consulted recommends exercise to counteract the effects of osteoarthritis.

People with diabetes are about twice as likely to have arthritis and join pain. Exercise, especially walking, helps osteoarthritis, just as exercise is beneficial for diabetics.

Some people believe eating nightshades contributes to joint stiffness and pain. If you are one of those, avoid foods like potatoes, tomatoes, eggplant, and peppers of all kinds.

References

Watson, Stephanie. “The Link Between Arthritis and Diabetes.” Arthritis Foundation, n.d.
https://www.arthritis.org/health-wellness/about-arthritis/related-conditions/other-diseases/the-link-between-arthritis-and-diabetes (accessed on 8/2/2020).