Mark Sisson is founder of Primal Nutrition, LLC, and Primal Kitchen, LLC, and the extensive product offerings of these enterprises can be found on this website.

Welcome! Mark is the author of numerous books, including The Primal Blueprint, which was credited with turbocharging the growth of the primal/paleo movement back in 2009. In 2017, he officially became a New York Times bestselling author with The Keto Reset Diet, which reached the #1 overall bestseller among all books on amazon.com for two days. Mark has written several other books, including popular Primal-themed cookbooks and lifestyle books. He is the publisher of MarksDailyApple.com, the #1-ranked blog for over a decade in its health and fitness category.

Read on for more about Mark's background from Mark himself:

I am the oldest of four children, born and raised in Maine. I was always interested in human health and athletic performance, probably because my father had been a top track and field athlete and inspired me to test myself at an early age (I even broke my leg at age two jumping off a rock). By age 12, I was holding one-boy track meets in my backyard, running laps around the block and pole-vaulting with a bamboo pole into a dirt pit. My mother was always interested in achieving good health through nutrition, so I also began devouring books on health and nutrition.

I excelled at cross-country and distance track events in high school and at Williams College, where I was a pre-med candidate and received my degree in biology. In fact, the running was going so well after college that I decided to forgo medical school for a few years (it’s at over 30 years now) and concentrate on a running career. I trained seriously as a marathoner for another five years, racking up well over 100 miles each week in training. The effort culminated in a top 5 finish in the 1980 US National Marathon Championships and a qualifying spot for the 1980 US Olympic Trials.

Unfortunately, by then the inhuman amount of training and weekly racing was taking its toll and I found myself constantly sick or injured. (Note to self: too much exercise is not a good thing). In fact, in my last year of competition, as a world class, extremely “fit” athlete, I experienced eight upper respiratory infections! Clearly I was ruining my immune system and my joints doing too much exercise. That’s when I started exploring nutrition and supplementation as a way to enhance my performance and to support my damaged body and bolster my immune system.

The running injuries—osteoarthritis and tendonitis—precluded ever racing at a high level again, but that was just about the time that the new sport of triathlon was starting to emerge, and I was immediately hooked. While I couldn’t run much anymore, I could certainly cycle and swim to my heart’s content…and I did. I spent a few more years racing triathlons, culminating with a 4th place finish in the Hawaii Ironman World Championships,

I finally retired from competition in 1988 and decided I would do whatever I could to help others avoid making the kinds of health mistakes that I had made. I figured I could use my pre-medical background, my degree in biology and an intense desire to unlock the health secrets that I knew were out there—answers to questions about health, wellness, anti-aging, safe weight-loss, nutrition and supplementation—to find the natural ways of achieving good health.

I wrote several books, including Maximum Results, The Fat Control System, The Anti-aging Report and The Lean Lifestyle Program (over 400,000 copies distributed). I edited the Optimum Health national health newsletter (circ. 90,000) from 1994 through 1996.