Dark leafy greens - Consume plenty of spinach, kale, bok choy, and Swiss chard. These veggies contain vitamins C, A, and K -- all of which act as antioxidants to protect you from free radicals. Free radicals are found in the environment, foods you eat, and pollution. They cause cellular damage, accelerate aging, and exacerbate the inflammation of arthritis pain. Have a salad daily to reap the benefits of leafy greens.