A pioneer in preventative medicine, Dr Dean Ornish, Professor of Medicine at the University of California, was the first physician to demonstrate that comprehensive lifestyle changes could reverse even severe coronary heart disease, without drugs or surgery.

He founded the Preventative Medicine Research Institute, where his current research shows that changes in lifestyle affect gene expression, "turning on" disease-preventing genes and "turning off" genes that promote disease. He argues that our natural state as humans is to be happy, healthy and peaceful, with our bodies possessing a remarkable capacity to heal.

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