Dr. Dean Ornish revolutionized medicine by directing clinical research provingfor the first timethat heart disease and early-stage prostate cancer may be stopped or even reversed by his program of comprehensive lifestyle changes, without drugs or surgery. His newest research was the first to show that changing your lifestyle changes your genes in men with prostate cancerturning on disease-preventing genes, and turning off genes that promote breast cancer, heart disease, and other illnesses, and in only three months. This study documented, also for the first time, that these lifestyle changes may significantly increase an enzyme that lengthens telomeresthe ends of your chromosomes that control how long you live. As your telomeres get longer, your life gets longer. Your genes are not your fate.