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Diet: The Only Real Hope For Arthritis
By John A. McDougall, M.D.
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Degenerative And Inflammatory
Arthritis of "no known cause" can be divided into two broad categories: degenerative arthritis and inflammatory arthritis. Degenerative arthritis most commonly represents a condition known as osteoarthritis. This is the most common arthritis found in people living in Western civilizations—seen in x-rays of the hands of over 70% of people 65 years and older. However, this same disease is comparatively rare in African and Asian countries, where people physically labor to survive (Br J Rheumatol 24:321, 1985). How can that be? Osteoarthritis is said to be due to wear and tear on the joints, so why is it less common among hard working people of underdeveloped countries? Nor does it explain why with light use, the hands of women often become twisted and deformed with age.
The inflammatory forms of arthritis include juvenile rheumatoid arthritis, rheumatoid arthritis, psoriatic arthritis, lupus, and ankylosing spondylitis. These aggressive diseases affect less than 5% of the people living in the United States today. Classifying these inflammatory diseases by different names, such as rheumatoid or lupus provides no further benefits to the patient, because it does not lead to better understanding of the cause of the inflammation, or to the successful treatment of the disease.
People diagnosed with degenerative arthritis (osteoarthritis) have inflammation in their joints in addition to the long-standing damage (degeneration). This inflammation can often be stopped with a change in diet and the swelling, pain, and stiffness relieved. What won't change in either form of arthritis is the permanent destruction left by years of disease, leaving deformity, stiffness and pain. To understand how most people with arthritis can be helped by a healthy diet, I will focus on the more aggressive inflammatory forms of arthritis.
Hope For Arthritis Sufferers
Arthritis is not a genetic disease, nor is it an inevitable part of growing older—there are causes for these joint afflictions, and they lie in our environment—our closest contact with our environment is our food. Some researchers believe rheumatoid arthritis did not exist anywhere in the world before 1800 (Arthritis Rheum 34:248, 1991). It is well documented that these forms of arthritis were once rare to nonexistent in rural populations of Asia and Africa (Chung Hua Nei Ko Tsa Chih 34:79, 1995; Arthritis Rheum 34:248, 1991). As recently as 1957, no case of rheumatoid arthritis could be found in Africa. That was a time when people in Africa followed diets based on grains and vegetables.
These once unknown joint diseases are now becoming common as people migrate to wealthier nations or move to the big cities in their native countries. With these changes they abandoned their traditional diets of grains and vegetables for meat, dairy products, and highly processed foods (J Rheumatol 19:2, 1992; Ann Rheum Dis 49:400, 1991). For example, although unknown in Africa before 1960, African-Americans lead in the incidence of lupus in the US (J Am Med Women's Assoc 1998;53(1):9-12). The mechanisms by which an unhealthy diet causes inflammatory arthritis are complex and poorly understood, but involve our intestine and immune system.
Intestine And Immune System
Increased Intestinal Permeability
The intestine forms an effective barrier to separate and exclude intestinal contents from the interior of the body. Only a single layer separates the individual from enormous amounts of antigens (foreign proteins) both of dietary and microbial origin. The intestinal mucosa absorbs and digests nutrients, turning large complex molecules into small simple ones. Normally, only the small molecules are allowed to pass through the intestinal wall, while the large ones that can act as antigens, causing immune reactions, have a limited ability to pass through. Infections and toxins can cause gaps in this barrier and allow large molecules to pass into the blood. This condition of increased intestinal permeability is referred to as a "leaky gut." Patients with inflammatory arthritis have been shown to have inflammation of the intestinal tract resulting in increased permeability (Baillieres Clin Rheumatol 10:147, 1996).
The largest amount of lymphoid tissue in the body is associated with the gut. This tissue protects the body from antigens that do get through the intestinal barrier. Unfortunately, an unhealthy diet—too high in fat, cholesterol, and animal protein—can compromise the capacities of the lymphoid tissue to destroy invading antigens that make it through the intestinal wall.
Fasting is known to decrease intestinal permeability, thus making the gut "less leaky." This may be one of the reasons fasting has been shown to dramatically benefit patients with rheumatoid arthritis (Scand J Rheumatol 1982;11(1):33-38). When patients return after the fast to a diet with dairy products, the gut becomes more permeable and the arthritis returns. An unhealthy diet containing dairy and other animal products causes inflammation of the intestinal surfaces and thereby increases the passage of dietary and/or bacterial antigens (Br J Rheumatol 33:638, 1994). A vegan diet (one with no animal products) has been found to change the fecal microbial flora in rheumatoid arthritis patients, and these changes in the fecal flora are associated with improvement in the arthritis activity (Br J Rheumatol 36:64, 1997).
In addition to being devoid of animal products, the diet needs to be very low in fat for maximum benefits. Dietary fat has a toxic effect on the intestine of experimental animals, causing injury that increases the permeability of the gut allowing more antigens to enter the body (Pediatr Res 33:543, 1993). Feeding high cholesterol diets to young animals also increases their "leaky gut" (J Pediatr Gastroenterol Nutr 9:98, 1989; Pediatr Res 21:347, 1987). Those vegan diets that have failed to help arthritis patients have been high in vegetable oils, which are know to damage intestinal integrity.
One dangerous paradox in arthritis treatment is that the drugs most commonly used to treat arthritis are toxins to this intestinal barrier. All commonly used nonsteroidal anti-inflammatory drugs (like Advil, Motrin, Naprosyn, etc.), apart from aspirin and nabumetone (Relafen), are associated with increased intestinal permeability in man. While reversible in the short term, it may take months to improve the barrier following prolonged use. (Baillieres Clin Rheumatol 10:165, 1996). read more›
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