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...

Tell Me More
Stay Connected

Category: Fitness

Dear Mark: Is Caloric Density the Answer?, Fat Starving the Brain, and High-Intensity Primal Endurance Training

For today’s edition of Dear Mark, I’m answering three questions from readers. First, should the primary focus in constructing a healthy diet be caloric density? Is the key to weight loss and optimal health the consumption of bulky, low-calorie foods? Next, a new study seems to show that fat “starves the brain.” Is this true? If not, what’s really going on? And finally, are following Primal Endurance principles antithetical to high intensity performance?

Let’s find out.

Read More

Why What You Walk (or Run) on Matters

I’ve always preferred traversing natural surfaces. Growing up in New England, I developed my cross country running chops actually running across the country surrounding my house. My favorite endurance events were those involving trees and trails to the point that I might still be doing them if they were exclusively nature-based. Even today, I cherish my hikes through the Malibu hills and rather begrudgingly go for neighborhood walks only because the sidewalk is so convenient. Walking on flat, linear, manmade surfaces is certainly fine, especially if I’ve got my wife or dog or a friend—or I’m exploring a new city—but naturally deposited ground full of dips and peaks and studded with random deformations is ideal.

And there’s growing evidence that it’s better for you, too.

Read More

Do Foam Rollers Really Work?

I own a foam roller. Every fitness facility I’ve visited in the last three years has hosted a large arsenal of foam rollers, lacrosse balls, and other instruments of fascial torture. The CrossFitter community has 2.3 per capita. I hear K-Starr sleeps on a bed made of lacrosse balls with foam rollers for pillows. Everyone and their grandma has one. I’m not even joking; I saw a group of track-suited seniors doing some kind of a synchronized foam rolling routine in the park recently. The things are everywhere. And you can certainly spend an inordinate amount of time rolling around on the things, causing all sorts of painful sensations that should, in theory, help you. But does it really help?

As I mentioned earlier, I have one. I’ve used it and, I think, benefited from it. But it hurts. It’s pretty much the most unpleasant thing you can do. Not just because of the pain, but also the tedium. It had better be worth the trouble.

Read More

15 Reasons Not to Trust That Latest Nutritional Study

Nutritional studies are often the best we’ve got. Without them, we’d be plucking anecdotes from a swirling vortex of hearsay, old wives’ tales, and prejudices. Some actionable information would definitely emerge, but we wouldn’t have the broader vision and clarity of thinking offered by the scientific method. Most of them are deeply flawed, though. And to know which ones are worth incorporating into your vision of reality and which only obfuscate and further muddy the waters, you have to know what to watch out for.

Today, I’m going to discuss many of the reasons you shouldn’t trust the latest nutritional study without looking past the headlines.

Read More

Dear Mark: Do I Need to Eat More, Testosterone Levels, HRV and Carbs

For today’s edition of Dear Mark, I’m answering three reader questions. First, if things are going well on a relatively low-calorie intake, should you just keep on keepin’ on or should you increase food intake to “get ahead” of your needs? Next, what’s the deal with a study showing a high-carb diet is better for testosterone levels than a high-protein one? What does this mean for your Primal way of eating? And finally, can an improvement in heart rate variability after a carb refeed indicate a greater need for carbs?

Let’s go:

Read More

How Going Primal Can Help With 5 Common Genetic Mutations

As I mentioned earlier this year, our personal ancestry can help determine how we respond to certain dietary, behavior, exercise, and lifestyle patterns. The big question remaining is this: does going Primal mesh with some of the more common polymorphisms? Yes. The Primal Blueprint is a living document. Its foundation rests on pre-agricultural human evolution, but by remaining flexible and offering ample room for personalization, it acknowledges the fact that evolution has continued to occur.

Let’s take a look at five genetic mutations and how the Primal way of eating, living, and moving can help mitigate their downsides.

Read More

Join Over 300,000 Subscribers!

Signup and get:

Primal Blueprint Fitness plus 7 other eBooks
7-Day Course on Primal Fundamentals
Special Offers and More!