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Nathan Pritikin (1915 – 1985) was an American nutritionist and longevity research pioneer.

Pritikin was born and raised in Chicago, Illinois. He attended the University of Chicago from 1933 to 1935 but did not achieve a degree. He became an inventor in the fields of chemistry, physics, and electronics in Chicago and Santa Barbara, California.

Diagnosed with heart disease in the 1950s, he engaged in a low-fat diet that was high in unrefined carbohydrates along with a moderate aerobic exercise regime. His dietary and exercise regime became known as "The Pritikin Program for Diet and Exercise" in a book co-authored by science writer Patrick M. McGrady, Jr., which stayed on the New York Times Bestseller List for 52 weeks and sold millions of copies and changed people's health and lives for the better world-wide.

When his own disease improved substantially, he established the Pritikin Longevity Center in 1976 and served as its director. Now called the Pritikin Longevity Center & Spa, it offers controlled diet, counseling in lifestyle change and exercise in a resort/spa-type setting. Pritikin also served as chairman of the Pritikin Research Foundation.

In the early 1980s, he began to suffer severe pain and complications related to his decades-long fight with leukemia, which had been in remission for 27 years. He committed suicide on February 21, 1985.

This author page uses material from the Wikipedia article "Nathan Pritikin", which is released under the Creative Commons Attribution-Share-Alike License 3.0