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: Weight Loss

What Is the Vagus Nerve? (and How Does It Impact Health, Mood and Performance?)

In recent years, I’ve regularly vouched for the gut as our long-abused secondary brain. Given what most of us grew up learning in school, it can feel like a mammoth shift. Science and philosophy have long revered the brain as seat of consciousness, even the seat of humanity itself. But when it comes down to it, everything is interconnected. Our consciousness extends well beyond the brain. How we feel and who we are encompasses a much more expansive and intricate system than any of us learned in high school biology. At the center of this paradigm revision is something called the vagus nerve.

Vagus…as a word it sounds a little off-putting. If someone called me a vagus, I’d probably be mildly offended. But the literary origins of this word are actually kind of mystical: “vagus” in Latin translates to “wandering.” And I’d struggle to find a more apt definition.

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Dear Mark: More of Your Challenge Questions Answered

For today’s edition of Dear Mark, I’m answering 11 questions. I answer questions about nutrient deficiencies and tremors, breastfeeding on the 21-Day Primal Blueprint Challenge, cheating without apparent consequences, sun exposure without vitamin D, maintaining insulin sensitivity, going high protein, recovering from a labral tear, going 90/10 vs. 80/20, black beans vs. potatoes, why I chose to live in Malibu, and recovering minerals lost to glycogen depletion.

Let’s go:

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Dear Mark: Your Challenge Questions Answered

Last week, you guys asked me a ton of questions as part of a contest. Today, I’m going to answer an initial batch. (If you don’t see yours, check back on Mondays to come when I’ll take up others.) First, can excess fat be stored as body fat? If so, how? Second, can this way of eating help with seasonal allergies? Third, what’s the proper pushup progression for someone who can’t do a full one? Fourth, when should I take my probiotics, vitamin D3, and fish oil? Fifth, is canned fish a viable way of obtaining omega-3s, or does the canning process damage the fats? Sixth, is there a trick to beating a weight loss plateau? Seventh, is there a way to make sardines palatable? And eighth, if you can’t walk one day, can you make it up the next?

Let’s go:

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Dear Mark: Raising HDL Particle Number, Who Should Try Ketones, and Where’s My Keto Energy?

For today’s edition of Dear Mark, I’m answering three questions from readers. First up, what’s the best way to increase your HDL particle count? There are dozens of articles explaining how to reduce LDL-P, but what about HDL-P? Second, are ketones right—or necessary—for everyone? The final question comes from a reader who, despite sticking with the diet for four months, hasn’t felt the fabled “keto energy.” Should she try ketone supplements, give it more time, or what?

Let’s go:

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Dear Mark: What Does High HDL Mean? and Is Exercise Good or Useless for Weight Loss?

Today’s edition of Dear Mark is a relatively brief two-parter, but it’s a good one. First, I answer a question about HDL. Is higher good? Is higher (sometimes) bad? How does a person make sense of all the seemingly conflicting information? Then I explain how two statements about exercise and weight loss can be simultaneously correct and apparently contradictory. Is weight loss effective or useless for weight loss, or what?

Let’s go:

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Can You Retrain Your Taste?

Following the switch to Primal eating, people often share curious observations about their shift in taste. After a lifetime of eating sugar, grains, artificial flavors and hydrogenated oils, they’re often taken by surprise at the way their tastebuds react to a low-sugar, whole foods-based diet.

Granted, it doesn’t happen overnight, but it happens. Many say the effect sneaks up on them over the course of several weeks until one day they realize their sense of taste has gone into hyperdrive.

Then they look across the cubicle aisle and watch their coworkers inhaling bags of chips or uninterestingly sucking away on sugary beverages. And it occurs to them: all those wasted years as their tastebuds languished in processed monotony.

It’s one of the unexpected upsides of the Primal Blueprint diet: learning/relearning the nuance of real food flavor. The experience doesn’t just reflect a psychological shift either. Taste acclimatization is a real, measurable thing.

What do we know about the process? Quite a bit actually. Some of it rather surprising….

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