Swank's research on 144 patients over a 34 year period was published in one of the worlds leading medical journals, The Lancet on July 7th 1990. The results of the study showed that those who followed the diet had not shown any significant deterioration of their condition over a 34 year period. Conversely, those that did not follow the diet did significantly deteriorate over the same period. More recent articles, have shown that after 44 years, the patients who had continued to follow this diet had not shown any significant deterioration of their condition.
Dr. Swank no longer treats patients himself, but The Swank MS Foundation is a public charity that provides information and resources on the diet.
Dr. Swank's research has been disputed by some, due to lacking documented double blind testing. For that reason, many in the medical community do not accept the Swank Diet as a treatment for MS.
"Effects of Low Saturated Fat Diets in Early and Late Cases of MS", Roy Laver Swank Barbara Brewer Dugan The Lancet July 7 1990 vol 336 pp 37-39