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

Tag: hormones

How Exercise Makes Us Feel

How did you feel after your last workout? (Apply as many adjectives as fit the occasion.) Now think about how others perceive exercise. Let’s say you stop a random hundred people on the street and ask them how exercise makes/would make them feel. I’m going to guess you’d get an interesting cross-section of answers, likely slanted toward the negative (mostly from people who don’t regularly exercise, but – hey – that’s just MY guess, right?). Call me cynical, but when many people think about exercise, I think their minds go directly to pain, soreness, sweat, and the general unpleasantness of it all. That’s unfortunate to say the least. I’m not going to claim that my most intensive workouts don’t leave me tired or even slightly sore (genuine pain is something different). Nonetheless, I get way too much out of my Primal exercise to feel it’s something to be “endured” – or even avoided. This brings me to those other answers – the ones more likely from folks who exercise on a regular basis (whether their workouts involve gym time, outdoor play, an active hobby or something else). What else does exercise make us feel – in the moment, after the workout and later once the results start showing?

Let’s just jump right in, shall we?

Read More

Why We Eat: Hunger

It sounds like the question of a 4-year-old making his first forays into understanding life, biology, and the nature of the universe: “Mom, why do we eat?” On some level, there’s an answer that’s both basic and true – the kind with which we’d respond to little Junior: “We eat because we’re hungry.” If it – and we – were only that simple…. Beyond the hormonal cues that tell us our bodies need feeding exists an intricate constellation of reasons. They stem from the gamut of higher order thinking, social reference and self-organization that characterize the human mind. And just when you thought the biological picture was at least an easy call, it’s important to note the environmental inputs that can skew our hormonal responses and convince us we need to raid the refrigerator at midnight. (Yes, analyzing human instinct can feel like nailing Jello to the wall.) So, what are the various reasons we eat? What influenced your food intake today? Truth be told, sometimes we’re not even conscious of our simplest motivations. I thought I’d take up the multifaceted question in a series of articles. We spend a lot of time talking about what we eat/should eat, and the why can lead us down some interesting roads in terms of both research and experience. But let’s start today with the fundamental biology behind our food intake.

Read More

Dear Mark: Young Guy, Low Testosterone; RS for Babies; and Sprints vs Tempo Runs

For today’s edition of Dear Mark, I answer three questions. First up is a young guy with low testosterone. He eats the right foods, does the right exercises, and has lived the right number of years, but he’s saddled with the testosterone of a much older man and wants to know why. Next, I discuss whether resistant starch is suitable or important for infants. The parents are benefiting from it, but does that mean an infant needs it, too? And finally, I explore the value of tempo runs – tough but doable runs maintained at the anaerobic threshold pace – for fat loss. How do they compare to my favorite fat burning exercise – sprints?

Let’s go:

Read More

Does Skinny Equal Healthy?

Everyone has that friend with an interdimensional portal for a stomach. They eat whatever they want in massive quantities and never seem to gain a pound. They’re skinny, despite their best efforts to the contrary and our barely concealed envy. And everyone assumes that they’re healthy because they’re skinny.

But are they? Is skinny all it’s cracked up to be? Does it always equal healthy? Are these effortlessly skinny people more likely to be healthy than the person who struggles with their weight and has to watch what they eat?

Read More

You Are What You (Think You) Eat

Last week’s post on marketing took me in an interesting turn this week. I stumbled on an article on NPR highlighting a past but very provocative study that I’ve been toying with for a couple of days now. Having spent years researching the placebo effect, Alia Crum, a clinical psychologist and researcher for Columbia Business School, was intrigued by the possibility that food could also be subject to certain physical placebo-generated outcomes. She wondered if our beliefs about a food or drink could influence the effects it physically elicited in us. After all, if what we believed about a sugar pill could make a measurable difference in our physiological functioning, why would a food product be any different? And on that note, weren’t we all being constantly fed (pardon the pun) elaborate messages about the food we bought? Did the variety of labels and claims somehow weave themselves in our mental fabric enough to not only impact our consumer behavior but maybe our body’s responses themselves?

Read More

The Definitive Guide to Resistant Starch

A few years back, I briefly covered a throwaway Yahoo! article about how “carbs will make you lose weight” because so many readers had emailed about it. It turned out that the “carbs” in the article were resistant starch, a type of carbohydrate that our digestive enzymes cannot break down. I’ll admit now, with regret, that I didn’t look as deeply into the matter as I might have. I didn’t dismiss resistant starch, but I did downplay its importance, characterizing it as “just another type of prebiotic” – important but not necessary so long as you were eating other fermentable fibers. While technically true, we’re fast learning that resistant starch may be a special type of prebiotic with a special place in the human diet.

Read More

Dear Mark: Wheat Germ Agglutinin and Leptin, Early Allergen Introduction, Fasted Training, Green Bananas, and Sunchokes

For today’s edition of Dear Mark, we’ve got a five-parter. First, I discuss wheat germ agglutinin’s potential interaction with the leptin receptor. Next, I explore the prospect of introducing gluten and peanuts (among other potential allergens) to youngsters as a way to prevent allergies from developing. I also discuss whether fasted workouts are a sound strategy to boost fat burning, if any good non-nightshade sources of resistant starch exist, and the nutritional benefits of sunchokes.

Let’s go:

Read More

Dear Mark: Milk Thistle and Estrogen, Low Libido, and Pollution Mitigation

For today’s edition of Dear Mark, we’ve got a three-parter. First, I cover the potentially estrogenic effects of milk thistle extract and discuss whether or not it’s a problem for your endocrine health that outweighs the benefits to liver health. Next, I discuss the reasons why someone might have a low libido eating a paleo style diet, and give a few potential solutions to explore. And finally, Carrie helps a reader figure out some ways to mitigate or avoid the damage wrought by air pollution. It’s everywhere these days, but that doesn’t mean we have to sit there and accept our fate.

Let’s go:

Read More

The “Inevitabilities” of Aging: How Inevitable Are They?

How many times have you heard some old timer attribute the dysfunction of a body part or physiological attribute to “gettin’ old”? Or how about that time you tweaked your back and everyone was quick to tell you to get used to it because it’s never going to get any better? “It’s all downhill after 30!” The funny thing is that this is somehow supposed to make you feel better about your prospects. Some people, I guess, prefer to have control over their health wrested out of their hands and distributed to the fates. Some people like the idea of letting “nature take its course.” At least that way nothing that goes wrong is your fault, because you never had a chance anyway. You were always destined to get all soft and flabby, lose your hearing, get brittle bones, and be unable to go to the toilet by yourself. Right?

Wrong. Age isn’t “just” a number, and we can’t maintain Dorian Gray-esque vigor all through life, but that doesn’t mean we’re destined to be frail, brittle things relegated to chairs and walkers and homes and doctor’s offices.

Today, let’s take a look at some common “inevitabilities” of aging and why they may not be so inevitable after all.

Read More

5 Helpful Analogies for Understanding Complex Health Issues

For millennia, the best teachers have used stories, analogies, and parables to break down complicated concepts into understandable bits that everyone can grasp. Aesop’s fables, the greatest religious texts throughout history, and Plato’s allegory of the cave are some of the most famous, showing us how to live morally, contemplate our existence, and make our way through the dilemmas that comprise everyday life. Today, I’m going to discuss five simple analogies that can help you understand five complex health topics a bit better, or perhaps be able to introduce them to the people (often skeptical or less-than-scientifically-inclined friends and relatives) around you who could use the lesson.

Let’s get right to it:

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!