1. Introduction -- 2. Classification, pathology and measures of disease assessment -- 3. Aetiology and risk factors for osteoarthritis and rheumatoid arthritis -- 4. Current management of ostcoarthritis and rheumatoid arthritis -- 5. Nutritional status and adequacy of the diet in rheumatoid arthritis and osteoarthritis -- 6. Popular dietary approaches -- 7. Exclusion, vegetarian, vegan and other dietary approaches in rheumatoid arthritis -- 8. Role of micronutrients in the amelioration of rheumatoid arthritis and osteoarthritis -- 9. Polyunsaturated fatty acids in the treatment of arthritis -- 10. Glucosamine and chondroitin in osteoarthritis -- 11. Other foods or supplements marketed for arthritis relief -- 12. Assessment of level of evidence for nutritional recommendations and suggestions for the future.