Multiple Sclerosis in Rural Norway

THE investigation of the distribution of cases of multiple sclerosis in Switzerland between the years 1918 and 1922 seems to have established that the frequency of this disease can vary greatly in different geographic locations.1 The subsequent studies by Gram2 in Denmark and more recent investigations in the United States3 , 4 leave little doubt that these variations may be real and not due to technical errors in diagnosis, methods of collecting the data and so forth.In another study, Swank5 has suggested the possibility that these variations are related directly to the amount (and possibly the nature) of the fat consumption. . . .