Meet Mark

Let me introduce myself. My name is Mark Sisson. I’m 63 years young. I live and work in Malibu, California. In a past life I was a professional marathoner and triathlete. Now my life goal is to help 100 million people get healthy. I started this blog in 2006 to empower people to take full responsibility for their own health and enjoyment of life by investigating, discussing, and critically rethinking everything we’ve assumed to be true about health and wellness...

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Category: Sun Exposure

Nature’s Serum: 9 Ways To Take Advantage of Avocado Oil’s Skin and Hair Benefits

Much has been made of avocado oil’s ample nutritional benefits; however, its healing properties for skin and hair are too often overlooked. Sure, it’s hard to compete with improving lipid profiles and combating systemic inflammation, but this clean eating elixir offers advantages beyond interior health. While Mark has mentioned using avocado oil as a regular skin moisturizer, in truth there are many applications to nurture both skin and hair. Whether you’re interested in natural cosmetic ideas or simply basic skin and hair health, avocado oil offers a nutritive, non-toxic tool for your care routine.

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Great American Campout, Worker Bee Trips, and a Contest!

On June 23rd, the world changes. Every RV, Subaru Outback, and pickup truck in every neighborhood across the country disappears from city limits. Expect the swoosh of fiberglass poles sliding through tent fabric to resound across the land and millions of campfires to produce enough smoke to block out the sun. Molted marshmallow flows will destroy hundreds of homes, and millions of fathers sitting on Doug fir rounds by the fire will tell so many ghost stories that they summon actual phantoms from the spirit world. The nation’s circadian rhythms will get a hard reset back to the superior factory settings, thanks to avoidance of artificial light after dark. Or so we could hope….

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Dear Mark: More Embracing Your Wildness

Last week’s Q&A about cultivating wildness was a lot of fun, but there were some questions I didn’t get to in the original post. Today, I’m going to answer some more. From stirring stories of a father and son pursuing and living their dream after experiencing extreme tragedy to how to go barefoot more safely to the balance between creativity, progress, and Primal values to accepting the reality (and beauty) of having work to do to the value of sun exposure in winter to circadian entrainment. In short, we’re covering a ton of ground today.

Let’s go:

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Primal Challenge Point: Test Vitamin D Levels

“In the winter months, when the sun’s rays are not intense enough to generate sufficient vitamin D production (this is the case for three to five months per year for locations in North American—you know it’s downtime for D when you can’t get a tan even with prolonged sun exposure), supplements and safe-designated artificial tanning implements can be useful or even essential if you are at high risk for deficiency.

If you have an indoor-dominant lifestyle or even a hint of aforementioned risk factors, you should regularly test your blood for vitamin D. (Make sure it’s for ’25-vitamin D’ or ‘serum 25(OH)D.’ You can order this test directly from an online provider like direct labs.com. or, if you are getting a routine checkup, insist they include vitamin D in your blood panels. (Unfortunately, it’s often not included.)”

—From The New Primal Blueprint

For more on vitamin D sources, deficiency, testing and recommended levels, see The New Primal Blueprint or check out past articles on MDA.

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Dear Mark: Hormone Normalizing Questions

For today’s edition of Dear Mark, I’m answering questions from last week’s hormone normalization post. First I discuss a lack of purpose in the mornings affecting sleep and what to do about it. Next, I explore the prospect of sun and fasting as hormone modulators. After that, I explain the meaning of max aerobic heart rate and correct a mistake I made. And finally, I suggest to one reader that she may need to eat more calories to normalize her sleep and thus her hormones.

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Dear Mark: Why are Male Fertility and Testosterone Levels so Low?

For today’s edition of Dear Mark, I’m answering just one question. But it’s a good (well, maybe not good, but certainly important) one: Why is male fertility on the rise and testosterone on the wane? The popular notion is that women flushing birth control pills and peeing estrogen-rich urine into the public water supply are the primary reasons for the sex hormone issues facing men, but I’m not so sure. Let’s explore what else might be causing the problem.

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