Absence of Toxicity of Oats in Patients with Dermatitis Herpetiformis
Catherine M. Hardman, M.R.C.P., Jennifer J. Garioch, M.R.C.P., Jonathan N. Leonard, M.D., Huw J.W. Thomas, F.R.C.P., Marjorie M. Walker, F.R.C.Path., Jennifer E. Lortan, F.R.C.Path., Angela Lister, B.Sc., S.R.D., and Lionel Fry, M.D.
Background People with gluten sensitivity should avoid foodscontaining wheat, rye, and barley, but there has been debateabout whether they should avoid oats. Although patients withceliac disease have recently been shown to tolerate oats, lessis known about the effects of oats on patients with dermatitisherpetiformis.
Methods We studied seven men and three women (mean age, 58 years)with biopsy-confirmed dermatitis herpetiformis. They had followeda strict gluten-free diet for a mean of 15.8 years, which controlledtheir rash and enteropathy. The patients added oats that werenot contaminated with gluten to their diets for 12 weeks (mean[±SD] daily intake, 62.5±10.8 g).
Results None of the patients had any adverse effects. Serologictests for antigliadin, antireticulin, and antiendomysial antibodieswere negative before oats were introduced into the diet andafter they were discontinued. Villous architecture remainednormal: the mean (±SE) ratio of the height of villi tothe depth of crypts was 3.59±0.11 before the diet and3.71±0.09 afterward (normal, 3 to 5), and the mean enterocyteheights were 31.36±0.58 µm and 31.75±44µm, respectively (normal range, 29 to 34). Duodenal intraepitheliallymphocyte counts all remained within normal limits (mean, 13.8±1.03per 100 enterocytes before the diet and 14.2±1.2 per100 enterocytes afterward; normal range, 10 to 30). Dermal IgAshowed no significant changes.
Conclusions Patients with dermatitis herpetiformis can includemoderate amounts of oats in their gluten-free diets withoutdeleterious effects to the skin or intestine.
Source Information
From the Departments of Dermatology (C.M.H., J.J.G., J.N.L., L.F.), Gastroenterology (H.J.W.T.), Histopathology (M.M.W.), Immunology (J.E.L.), and Nutrition (A.L.), St. Mary's Hospital, London.
Address reprint requests to Dr. Hardman at the Department of Dermatology, St. Mary's Hospital, Praed St., London W2 1NY, United Kingdom.
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