I admire Dr. Bernstein (author of
The Diabetes Solution among other books). He's cured his type 1 Diabetes problems mainly through diet (low carb). However, his doctors wouldn't listen to how he succeeded, so he became a doctor primarily so that his studies could be published in medical journals.
As former astronaut and family physician Duane Graveline says, "This is a sad commentary of the reality of challenging orthodoxy."
The following information is from Dr. B's
site:
"He then began to measure his blood sugar about 5 times each day, and soon realized that the levels were on a roller coaster. To even out his blood sugars, he adjusted his insulin regimen from one injection a day to two, and experimented with his diet by cutting down on carbohydrates. However, three years after he began measuring his own blood sugar levels, his complications were still progressing, so he researched scientific articles about the disease. What he found was astonishing: complications from diabetes had repeatedly been prevented, and even reversed, in animals. Not through exercise, but through normalizing blood sugars! This was an incredible revelation, since all of diabetes treatment during that time was heavily focused in other directions, such as low-fat diets, preventing severe hypoglycemia, and preventing ketoacidosis, a potentially fatal extreme high blood sugar condition.
Bernstein set out to achieve normal blood sugars, and within a year had refined his insulin and diet regimen to the point that they were normal around the clock. After years of chronic fatigue and debilitating complications, he felt healthy and energized. His serum cholesterol and triglyceride levels were now in the normal ranges, and friends commented that his complexion was no longer gray.
Now the trick was to get the word about his discovery out to doctors and those suffering from the disease, which proved an uphill battle. Bernstein knew that there were millions of diabetics whose quality of life could vastly improve, if only he had the means to reach them. As a layperson he had difficulty gaining the attention of those in the medical field, so in 1977, he decided to give up his job and become a physician—”I couldn’t beat ‘em, so I had to join ‘em.” 
At 45 years old, Richard Bernstein entered the Albert Einstein College of Medicine. In 1983 he opened his own medical practice near his home in Mamaroneck, New York. Today, Dr. Bernstein treats hundreds of patients a year, helping them to create effective personalized treatment plans that allow them to lead normal lives."