Raw milk from Jersey or Guernsey cows? Back in the early 1900s, it was used to help a few diabetic patients at the Mayo Foundation, the precursor to the Mayo Clinic.
"Patients with cardiac disease respond splendidly without medication. In patients who have been taking digitalis and other stimulants, the drugs are withdrawn. High blood pressure patients respond splendidly and the results in most instances are quite lasting. The treatment has been used successfully in obesity without other alimentation. One patient reduced from 325 pounds to 284 in two weeks, on four quarts of milk a day, while her blood pressure was reduced from 220 to 170. Some extremely satisfying results have been obtained in a few cases of diabetics."
"About ten years ago a very sick man came to the Sanitarium suffering from a severe cystitis and nephritis. He was a diabetic. As milk contains about five percent milk sugar, it was feared that he could not manage this amount of sugar. But he did manage it, and improved in every way and in eight weeks was sugar free. My experience with milk diet in diabetes has been limited, but very interesting. These few patients, only seven or eight, have been much pleased with the results. Insulin was used for a time in some of the cases. They all became sugar free, or nearly so, after from four to ten weeks. From the fact that these patients were able to use a much more liberal diet than diabetics usually can take [after the treatment], it would seem to indicate that at least a partial regeneration of the pancreas is not impossible."
This is an excerpt of "The Milk Cure: Real Milk Cures Many Diseases" written in 1929 by Dr. J. R. Crewe.