One of the ways fiber can help with arthritis pain is by reducing inflammation, as measured by an indicator called C-reactive protein (CRP), for the same reason fiber is a benefit to your heart. Studies found that people who eat a diet high in fiber (about 28 grams a day) reduce their CRP levels. Surprisingly, the effect is most pronounce in people within their desired body weight (by about 40%). Those who are overweight experience about a 10% reduction in inflammation. Increasing the amount of fruits and vegetables in the diet is key, as they are the best source of fiber. Foods rich in carotenoids (carrots, peppers, and other red & orange produce) were most strongly associated with CRP reduction. Strawberries specifically, were linked to lower CRP levels in an other study at the Harvard School of Public Health. Women who ate 16 strawberries per week were 14% less likely to have elevated levels of the inflammation indicator.
~ Medical University of South Carolina, 2010