Dean Ornish

At a glance

• Dean Ornish is an American physician and researcher. He founded and leads the non-profit Preventive Medicine Research Institute in Sausalito, California, and is a clinical professor of medicine at the University of California, San Francisco.
• In the Lifestyle Heart Trial (The Lancet, 1990), a small group of heart patients followed an intensive programme: a plant-based low-fat diet, exercise, stress management and group support. In most, less narrowing of the coronary arteries was measured after a year.
• Since 2010 the Ornish programme has been covered by Medicare in the US as intensive cardiac rehabilitation.
• He later studied the same approach in prostate cancer and, in a small randomised trial (2024), in people with early Alzheimer’s disease.
• His books include Dr. Dean Ornish’s Program for Reversing Heart Disease, Eat More, Weigh Less, The Spectrum and UnDo It! (2019).
• For longevity, his work shows that combining lifestyle factors can have measurable effects, although the studies are often small.
• Takeaway: don’t change just one thing; combine diet, movement, relaxation and social support.