Arthritis is a painful, chronic, and sometimes debilitating condition. According to the Arthritis Foundation, it is the most common cause of disability in the U.S. There are 53 million adults and nearly 300,000 children struggling with arthritis every day. While medications and other traditional approaches can bring relief, diet and supplements can also play an important role in alleviating the symptoms and the severity of the condition for many people. If you have arthritis, learn about some of the herbs, supplements, and foods you should be eating, many of which can be added to your favorite smoothie recipes.