Dr. Jens Kjeldsen-Kragh, M.D., of the Institute of Immunology and Rheumatology at the National Rheumatism Hospital of Oslo, conducted a study about the usefulness of vegetarian foods in arthritis. He found that switching to a vegetarian diet resulted in improved grip strength and much less pain, joint swelling, tenderness and morning stiffness in about 90 per cent of a group of arthritis patients, compared with controls eating an ordinary diet. The patients noticed improvement within a month, and it lasted throughout the entire year-long experiment. Dr. Kjeldsen-Kragh concluded that about 70 per cent of the patients improved because they avoided fats that are likely to instigate the inflammation process.