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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Month: June 2008

Dear Mark: Ketosis

Dear Mark,

What are ketones? How does ketosis play into the Primal Blueprint? Did our bodies evolve to run on ketones? If not, why do they exist?

Ketones, to put it briefly, are compounds created by the body when it burns fat stores for energy. When you consume a diet very low in carbohydrates, the body responds to the significantly lowered levels of blood sugar by flipping the switch to another power source. The body converts fatty acids in the liver to ketones. Ketones, then, become the main energy source as long as blood sugar levels remain low.

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Portion Distortion

Which came first, the larger waistline or the bigger portion size? This is like one of those philosophical questions about art imitating life or the chicken/egg paradox.

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Weekend Link Love – Edition 4

A Hearty Life briefs us on a new study suggesting that our socioeconomic standing in life determines our likelihood to recover from a heart attack!

Cognitive Daily is undergoing a site redesign an invites you to weigh in on the topics you’d most like to have them blog about.

Conditioning Research evaluated a study by Canadian researchers suggesting that almonds may be the key to reducing insulin fluctuations.

Dr. Briffa tells us why we need to keep up our Vitamin D (hint: it could save your life!).

Fitness Destinations gives us 11 tips for cooking out without pigging out (a great post toread before heading out to your 4th of July celebration!).

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The “As If” Challenge: Starter Recipes

So, you’ve decided to accept the Primal challenge. No time like the present, we say! To get you started we thought we’d share a few recipes in keeping with the “as if” challenge. No compromises or indulgences. It’s the PB diet straight up!

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Act “As If” – A 30-Day Primal Health Challenge

Last week we looked at what goes into our decisions to be healthy: the hows, the wheres, the whos and whys of consideration, of envisioning and finally of commitment. It’s a decision that puts ourselves at the core, we said.

Sometimes our path to that decision is smooth. Sometimes it’s a collection of fits and starts. Usually, it’s a little of both. Progress can come with slow, steady dedication and effort. But, oftentimes, there’s at least a few experiences when we put the pedal to the metal. Whether it’s an overwhelming, positive rush of internal motivation or the insistence of an external, swift kick in the pants, these instances of hyperdrive move us forward. And, yes, even if we lose some ground afterward, we’re changed for the experience nonetheless. We’ve felt that higher level of health, whether it be fitness, nutrition, life balance, etc. Even if we give up some of the result, we know how good it was, and mark our words, you’ll eventually crave it again and be back for more.

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Reader Response: Insulin Index

Reader Pete asked for some thoughts on the “Insulin Index,” a measurement chart similar to the glycemic index. While the glycemic index calculates the relative blood sugar rise induced by given foods, the insulin index evaluates the insulin response generated by 38 different foods.

The insulin index, which first made its appearance in a 1997 American Journal of Clinical Nutrition article, was primarily the creation of Susanne Holt, a graduate student at the time and now a doctor. Interestingly, Holt, her supervisory co-authors, or other researchers haven’t chosen to conduct further research to update the “preliminary” results of their insulin index study since its creation eleven years ago now.

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