dean ornish who looked at early stage prostate cancer.get a test to detect prostate cancer early. lots and lots of men who had a cancer that didn't need to be treated got treated anyway and it caused a lot of harm. >> there is little evidence they make you live longer, but many men think they are incontinent. >> we both wanted to try to bring the clinical testing to this hypothesis that lifestyle intervention can have an important impact on the early stage prostate cancer. i'm one of the busiest surgeons in in the country, though i don't believe all the men need immediate treatment. you treat them at the first sign of progression. if you can delay treatment, that man is not at risk of side effects in that period of time. >> dr. peter carroll and i collaborated with the doctor who won the nobel prize in medicine and she said stress creates shorter telemers. >> they are at the end of the chromosomes that have our genetic information. they wear down and get frayed. genetic color gets messed up. that prevents tissues from renewing themselves

dean ornish has studied and written about diet and heart disease for decades. >> in medical school, iry, with michael debeke, the heart surgeon. we cut people open, we bypass their blocked arteries and he would tell them they were cured and they'd go home and more often than not eat the same junk food, smoke, not manage stress, not exercise, and then often their bypasses would clog up. so we'd cut them open, we'd bypass their bypass, sometimes multiple times. i said, there's got to be a better way. i've spent more than 30 years of doing studies showing that heart disease can be reversed by changing what we eat, how we respond to stress, how much we exercise, and how much love and support we have in our lives. in our model the physician acts as a quarterback. he or she assembles a team of five other people to work with, a nurse, a yoga teacher, an exercise physiologist, a registered dietitian, and a clinical psychologist. and when we work at that level, we find people are much more likely to make these sustainable changes and the patient learns to empower themselves and transform their

a lot about preventative health and has been advocating about it well before it was so current to ornish. dr. dean about what your next innovation is in the field of preventive medicine. >> thank you. i am honored to be here. or 36 years, i have directed a study -- a series of studies showing a powerful difference changes in diet and lifestyle can make. we often have a hard time believing the simple choices we make each day like what we eat can make changes. moderate exercise like walking, stress management techniques, social support, these approaches can help to prevent most chronic diseases and reverse them. we are able to show for the first time even severe heart disease can be reversed by making these changes. instead of getting worse, people can get better. the more they change, the better they get. early stage prostate cancer may be stopped or reversed by making these same changes. tight to diabetes can be changed. when you change your lifestyle, it changes your genes within just a few months. it turns off those that promote cancer, diabetes, heart disease, and other conditions. we