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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Dear Mark: Grass-Fed vs Grain-Finished, Lamb Feedlots, and What About Grass-Fed Eggs?

For today’s edition of Dear Mark, I’m answering a few questions about grass-feeding several of you raised in last week’s comment section. First, is there a difference between grass-fed and grass-finished?What is the difference between grass-fed and grass-finished? Next, is it true that lamb is by definition grass-fed? Are there actually lamb feedlots, or can we be certain that the lamb we eat lived a fairly decent, grassy life? And finally, what about grass-fed eggs? Does such a thing even exist? After all, when most of us think about happy egg producers, i.e. fowl, are they munching away on their fair share of freshly sprouted greens?

Let’s find out:

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Dear Mark: Paleo Diet Fattening?

For today’s edition of Dear Mark, I’m answering one question. It’s a burning one, though, judging from the deluge of emails I’ve received in the past few days. A new study has just come out purporting to show the deleterious effects of a “paleo diet” on weight gain, fat gain, and glucose tolerance in type 2 diabetics. It sounds alarming, so today I’m going to explore just how relevant this study is for you guys following a Primal eating plan. Should you be concerned with the results? Is it time to start radically restructuring the way you eat? I’ll evaluate the study, and its larger implications, to let you know.

Let’s go:

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Dear Mark: A Few Collagen Questions

For today’s edition of Dear Mark, I’m answering some questions from the comment board of last week’s collagen post. You guys came up with some really interesting, useful ones that deserve closer examination. First, I explore whether—and how—increasing one’s collagen intake could conceivably worsen a person’s lipid profile. There’s actually a possibility, believe it or not. Next, I give a recommendation for optimal gelatin intake in terms of grams per day. After that, I tell a reader how to know if his store-bought broth is truly gelatinous (and offer an alternative source), discuss the worthiness of octopus and squid as collagen sources, and give a non-bovine gelatin recommendation to a beef-sensitive reader.

Let’s go:

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Dear Mark: How Many Sprints Per Week, How to Play and Train with Babies, and the Best Nighttime Snack

For today’s Dear Mark, I’m answering three questions. First, how often can a person sprint safely and effectively? There are many factors to consider when determining the amount of sprinting a person can handle each week, like stress levels, sleep, and other training, so it’s tough to give a specific number. Next, what are new parents supposed to do for physical play and exercise? Aren’t babies fragile, helpless things? No. As you’ll see, it’s possible and even desirable to expose your young children to intense (but fun) play and exercise and introduce elements of cautious risk-taking into your time with them. Finally, what’s the best nighttime snack alternative to nuts and dried fruit?

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Dear Mark: 21-Day Challenge Rapid Fire Edition, Part 2

Last week, I answered a bunch of the questions readers asked at the start of the 21-Day Challenge. You guys came up with so many great questions that I couldn’t get through all, or even most of them. So today, I’m back with another round of rapid fire answers to many of your questions. I talk about the utility (or lack thereof) of window-filtered sunlight in the winter, the need (or not) for 8 glasses of water a day, how fasting can impact fitness, why someone’s sleep might be suffering, which source of glycine is best, whether chlorine in a pool is bad for you, and many, many more.

Let’s go:

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Dear Mark: 21-Day Challenge Rapid Fire Edition

For one of the 21-Day Challenge contests last week, you guys asked dozens of questions. Today, I’m answering a bunch of them in rapid fire style including how to get kids to eat more meat and veggies, how to get adults to eat greens, whether keto can coexist with high-carb, if it’s better to eat seasonally and many, many more. Don’t expect long, drawn-out answers. I’m answering quickly and succinctly. If you have any further questions after hearing the answers, toss ’em in the comment section. There will always be more Dear Marks down the line.

Let’s get to it:

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Dear Mark: Drinking Breast Milk and Supplemental Foods For Dogs

For today’s edition of Dear Mark, I’m answering two questions. First, what’s the deal with adult humans drinking human breast milk? It appears to be a bit of a “movement,” but does it make nutritional sense? Does breast milk offer any unique benefits to grown humans? Then, I answer a reader question about giving coconut oil to dogs and followup with a wider discussion of potentially beneficial supplemental foods for our furry best friends.

Let’s go:

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Dear Mark: Easy Prebiotic Foods, NSAIDs and the Gut Bacteria, Plus Some Hydration Questions

For today’s edition of Dear Mark, I’m answering a bunch of questions from readers drawn from the comment sections. First, is there a better, whole foods-based alternative to prebiotic powders, meals, and flours? Turns out there are many, and I give a few of my favorites. Next, what’s the deal with NSAIDs and the gut? Everyone knows they increase leaky gut, but can they also affect the gut biome directly? I finish up by answering several readers questions regarding hydration. Can stevia replace syrup in the hydration solution I posted? Does anything change for post-menopausal women? Does milk work?

Let’s go:

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Dear Mark: Meat and Yogurt for Babies

For today’s edition of Dear Mark, I’m answering one question. It comes from Kristen, a new mother to a nine month-old who’s grown so passionate about baby nutrition that she’s decided to start a fresh food business for infants and toddlers. She’s a recent reader of the blog, though, and as such needs a little help understanding the role animal foods like meat and yogurt can play in infant feeding. For many years, the importance of meat in an infant’s diet was downplayed, denied, or ignored in pediatric nutritional guidelines. We now know that’s wrong and kids can really benefit when their first solids include animal products. Today, I explore exactly why it matters so much.

Let’s go:

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Dear Mark: Foods for a One-Year-Old, Vegan to Primal, and Low-Carb Failing Fibromyalgia

For today’s edition of Dear Mark, I’m answering three reader questions. The first comes from Chris, who’s a little worried his one-year-old isn’t eating a wide enough variety of foods. As it turns out, he doesn’t need to worry, though I do offer a few suggestions for foods to include or offer. Next, how should Verria, a long-time vegan, transition to Primal? Is there anything to watch out for? What physiological and psychological issues will Anita have to face and overcome? And finally, what tips do I have for a fibromyalgia patient whose condition hasn’t improved on a strict very low-carb, high-fat diet?

Let’s go:

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