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: Diet & Nutrition

Is Keto Bad for the Thyroid?

Keto is fantastic, everyone says. It’s a great way to lose weight, improve cognition, and stave off degenerative disease. It may help your performance in the gym and on the track. It could even give Grandpa some respite from Alzheimer’s.

But it’s hell on your thyroid. Right?

Keto detractors and proponents alike often warn that remaining in ketosis will tank your thyroid. The thyroid’s an important gland, exerting major influence over essential systems like fertility, energy, metabolism, body temperature regulation, blood lipids, and general wellness. It controls the metabolic rate of every organ in the body. We want it working well, so this is a major blow to keto—if the criticism holds true. Fortunately, there’s much more to this story.

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Dear Mark: Obesity as “First World Problem”?

For today’s edition of Dear Mark, I’m not so much answering a direct question as I am riffing on an offhand comment. In the comments from last week’s post on weight loss culture, someone mentioned obesity being a “first world problem.” It made me think more deeply about the issue.

In a literal sense, yes. Obesity is often a first-world problem. If your primary concern is figuring out how to stop yourself from eating too much food, you’ve got the kind of problems starving kids in developing countries would love to have.

Yet, industrial food has a long reach. The island nations of Nauru, Micronesia, Tonga, Cook Islands, and Niue are the top 5 fattest countries in the world—even though they aren’t “first world”—because they rely almost entirely on imported, industrial food.

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Adaptogens: Maca Root, Sea Buckthorn Oil, and Schisandra

I’ve covered a number of adaptogens over the past few months including American and Asian ginseng, ashwagandha, astragalus, and holy basil—and for good reason. They offer an effective means to combat stress as well as boost health and performance from a number of angles. I’ve enjoyed experimenting with many of them and even use some on a regular basis

I thought I’d continue the series with a look at 3 additional adaptogens: maca, sea buckthorn, and schisandra. See what you think.

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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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Dear Mark: Collagen Peptides, Fasting vs Sleeping, Dog Bone Broth, and Pork Broth

For today’s edition of Dear Mark, I’m answering four question. First, are collagen peptides just as effective as bone broth or other collagen sources? Second, how should I choose between IFing or sleeping like a baby using pre-bedtime nutrients that may impede autophagy? Next, I explore whether you should be making dog bone broth (it’s not what you think, so don’t worry about that). And finally, what are some of my favorite pork bone broth recipes?

Let’s go:

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The Definitive Guide to Bone Broth Benefits

I’ve been writing about bone broth for a long time. I’ve been drinking it even longer. I’m not sure you can get anything much more primal than a heap of bones cooked for hours into rich, gelatinous glory. Ritual and taste aside, however, I count quality bone broth as an important supplemental food. The copious health benefits are simply too substantial to pass up.

Some of you, I know, are bone broth fans—a few even connoisseurs. You’ve been making your own for decades, maybe with recipes you learned in your grandparents’ kitchen. But what does the average Primal type need to know about bone broth? What goes into making it? What are the distinct health advantages? Are there risks or downsides? What are the alternatives? Finally, what about some recipes? I’m glad you asked….

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