5. Tobacco
Though not technically a food, tobacco is something that people put into their bodies habitually. The link between cancer and tobacco use is well established. Turns out, tobacco can also exacerbate arthritis and make it more difficult to treat. Studies have shown that smokers have a higher risk for rheumatoid arthritis.
Tobacco is also known to degrade joints, bones, and connective tissue. Not only does smoking cause painful symptoms, it makes treatment for arthritis less effective and it can create additional complications if you ever need surgery. Basically, tobacco injures every part of your body that it touches. That could mean cancer, arthritis, or both.