Dean Ornish is a widely respected physician whose focus, at least publicly, has been on the impact of diet on heart disease. He's a big promoter of a vegetarian diet, but he's not some loon. Are people sure that Jobs was eating a special diet instead of normal medical care, or was he trying to eat right in addition to following doctors' orders? The fact that he had a liver transplant (possibly jumping a priority line), that he went to Switzerland for experimental treatment, and that he had radiation and chemotherapy pretty strongly indicates that he wasn't trusting his life to spinach and arugula.