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Deconstructing Vitamin D

June 01 2010 - Before phototropic plants began bending toward sunlight, before jellyfish developed ocelli, the light-sensing organs that allow them to distinguish between up (sunlight) and down, before the bikini-cl...

Vitamin D: Loose Ends

June 15 2010 - Okay, I’ll admit it. I may have spoken out of turn a couple week's ago when I tried to completely cover vitamin D in a mere three posts (Deconstructing Vitamin D, Vitamin D: Sun Exposure, Supplement...

Vitamin D and RDA for Children

May 31 2008 - It’s probably of little surprise that we take issue with some of the Recommended Daily Allowance values and how they’re often determined. Case in point: New research published in the Journal of Cl...

Primal Challenge Point: Test Vitamin D Levels

February 08 2018 - "In the winter months, when the sun's rays are not intense enough to generate sufficient vitamin D production (this is the case for three to five months per year for locations in North American—you ...

Vitamin D: Confounding Factors

June 03 2010 - Yesterday I recommended 4000 IU of vitamin D each day as a good starting point for most people. Though, it’s difficult – nay, impossible – to provide a perfect, universal prescription for vitami...

Vitamin D: Sun Exposure, Supplementation and Doses

June 02 2010 - From the presence of vitamin D receptors in our cells and vitamin D factories in our epidermis, along with the central role vitamin D plays in calcium metabolism, immunity, and gene expression, it’s...

Dear Mark: Transdermal Magnesium and Vitamin D/B12 Products for a Vegetarian

November 14 2016 - For today's edition of Dear Mark, I'm answering two questions. The first one concerns transdermal magnesium. Does it work? Can magnesium actually permeate the skin and enter circulation? Probably. And...

Monday Musings: Vitamin D, Toxic Strawberries, New PUFAs Coming Soon

December 06 2010 - A quick look at Google Trends shows a clear, undeniable trend: that of regular folks armed with curiosity, questions, and Internet connections taking their health into their own hands and searching fo...

Dear Mark: Hempseed, Too Much Omega-3, and Vitamin D’s Halflife

August 15 2011 - It's a lovely summer morning here in Malibu. The cool sea breeze keeps the coming warmth at bay, for now, and makes me glad for the hot mug of coffee I'm clutching. I've still got a couple hours befor...

Dear Mark: Ornish Strikes Again, Vitamin D from Light Boxes, and Kimchi and Cancer

October 02 2012 - Ah, it's good to be back in the saddle again. The challenge was a lot of fun - don't get me wrong - but ultimately both you guys and I come here for the dispensation of musings and information and wri...

Deconstructing Vitamin D

June 01 2010 - Before phototropic plants began bending toward sunlight, before jellyfish developed ocelli, the light-sensing organs that allow them to distinguish between up (sunlight) and down, before the bikini-cl...

Vitamin D: Loose Ends

June 15 2010 - Okay, I’ll admit it. I may have spoken out of turn a couple week's ago when I tried to completely cover vitamin D in a mere three posts (Deconstructing Vitamin D, Vitamin D: Sun Exposure, Supplement...

Vitamin D and RDA for Children

May 31 2008 - It’s probably of little surprise that we take issue with some of the Recommended Daily Allowance values and how they’re often determined. Case in point: New research published in the Journal of Cl...

Vitamin D: Confounding Factors

June 03 2010 - Yesterday I recommended 4000 IU of vitamin D each day as a good starting point for most people. Though, it’s difficult – nay, impossible – to provide a perfect, universal prescription for vitami...

Vitamin D: Sun Exposure, Supplementation and Doses

June 02 2010 - From the presence of vitamin D receptors in our cells and vitamin D factories in our epidermis, along with the central role vitamin D plays in calcium metabolism, immunity, and gene expression, it’s...

Dear Mark: Transdermal Magnesium and Vitamin D/B12 Products for a Vegetarian

November 14 2016 - For today's edition of Dear Mark, I'm answering two questions. The first one concerns transdermal magnesium. Does it work? Can magnesium actually permeate the skin and enter circulation? Probably. And...

Monday Musings: Vitamin D, Toxic Strawberries, New PUFAs Coming Soon

December 06 2010 - A quick look at Google Trends shows a clear, undeniable trend: that of regular folks armed with curiosity, questions, and Internet connections taking their health into their own hands and searching fo...

Dear Mark: Hempseed, Too Much Omega-3, and Vitamin D’s Halflife

August 15 2011 - It's a lovely summer morning here in Malibu. The cool sea breeze keeps the coming warmth at bay, for now, and makes me glad for the hot mug of coffee I'm clutching. I've still got a couple hours befor...

Dear Mark: Ornish Strikes Again, Vitamin D from Light Boxes, and Kimchi and Cancer

October 02 2012 - Ah, it's good to be back in the saddle again. The challenge was a lot of fun - don't get me wrong - but ultimately both you guys and I come here for the dispensation of musings and information and wri...

Dear Mark: Vitamin D for Babes, Ingredient Bait and Switch, and Kettlebellin’ for Strength or Cardio?

June 29 2015 - For today's edition of Dear Mark, we've got a three-parter. First up is a controversial topic: vitamin D supplements for breastfeeding babies. Do they need it? Can they get enough through mother's mil...

Dear Mark: Vitamin D for Babes, Ingredient Bait and Switch, and Kettlebellin’ for Strength or Cardio?

June 29 2015 - For today's edition of Dear Mark, we've got a three-parter. First up is a controversial topic: vitamin D supplements for breastfeeding babies. Do they need it? Can they get enough through mother's mil...

Dear Mark: More of Your Challenge Questions Answered

January 23 2017 - 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 appa...

8 Primal Rules for Building Better Bones

March 29 2016 - Strip away the skin, fascia, muscles, organs, blood vessels of a human and you're left with the bones: the foundation providing passive structural support. Many people accept that we can affect and ev...

Can Getting Your DNA Tested Help You Optimize Your Diet and Training?

February 24 2015 - Last month, I received an unexpected email request from a man named Craig Pickering: “Send me your saliva.” Craig works for DNAFit, a genetic testing company using customers’ DNA results to o...

CrossFit Training: How Going Primal Will Enhance Recovery

August 10 2017 - Exercise is a major stressor. But it's a major acute stressor, rather than a chronic one. It hits us, then it's over, and we recover. When the next session rolls around, we're better/faster/stronger/...

Need to Know Factors for Bone Health

July 12 2017 - At the heart of every building is its framework. That latticework of timber, concrete or steel is what holds the entire structure up. Without it, there’d be no building at all. I think of that phras...

Dear Mark: Calcium Supplements, Goitrogenic Foods, High-MUFA Seed Oils, and Jogging

September 05 2011 - Today's edition of "Dear Mark" covers a variety of topics. We've got calcium supplementation - does it make sense and is it safe? Then, I briefly discuss cruciferous vegetables, which are said to have...

How to Leverage the Minimum Effective Dose in Your Primal Life

December 02 2014 - If you haven't heard about the minimum effective dose, a concept coined by Nautilus fitness creator Arthur Jones and popularized by lifestyle hacker Tim Ferriss in his book The Four Hour Body, here's ...

Does Diet Influence Menopause Timing?

June 13 2019 - Last week, I linked to a story about a popular vegan blogger, author, and influencer who found herself going into menopause at the age of 37 despite doing "everything right." She exercised, she ate ra...

CrossFit Training: How to Add Mass and Build Strength with Primal

August 01 2017 - Gaining mass and building strength while CrossFitting should be a breeze. You're lifting heavy things using compound full-body movements like squats, deadlifts, and presses, providing a potent growth ...

Dear Mark: More of Your Challenge Questions Answered

January 23 2017 - 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 appa...

12 Ways to Boost Your Serotonin

November 11 2020 - Serotonin is a funny one. Although the prevailing sentiment is that we want to "increase serotonin," it's not that simple. There's no indication that more serotonin is necessarily better in every s...

How to Leverage the Minimum Effective Dose in Your Primal Life

December 02 2014 - If you haven't heard about the minimum effective dose, a concept coined by Nautilus fitness creator Arthur Jones and popularized by lifestyle hacker Tim Ferriss in his book The Four Hour Body, here's ...

How to Ensure Your Final Years Are Good Ones

February 11 2014 - We talk about aging gracefully, but what does it mean? How does one age gracefully? To me, it means ensuring your final years are good ones. Basically, we want to avoid the "regular" maladies of agin...

Actionable Ways to Avoid Holiday Stress

November 17 2020 - It’s the most wonderful time of the year again! The time for family gatherings (but not this year), holiday feasts (maybe), and, according to my TV, buying brand new his-and-hers SUVs (not ever). ...

Dairy Intolerance: What It Is and How to Determine If You Have It

December 24 2013 - I often say that "dairy is fine and even healthy if you tolerate it." But what exactly does that mean? How do you know if it's "not okay"? You could be reacting poorly to the lactose, the casein, the ...

Why Do I Feel Tired All the Time?

April 28 2020 - “I’m tired all the time.” “I have no energy.” “I’m too tired to go to the gym.” “I need a nap.” Walking around in a fog seems like standard operating procedure nowadays. No m...

Dear Mark: Fasting Followup

February 27 2017 - For today's edition of Dear Mark, I'm answering questions from the comment section of last week's fasting post. You guys brought up some great points, and I'll be addressing some of them. First up, do...

Winter Blues: How Cold, Dark Days Can Take a Mental Toll

December 10 2015 - After last week’s look at what winter does in terms of physical symptoms, I’d be lax to not address the obvious elephant in the living room: mental health in the colder, darker season. I’ll admi...

Blindspots Even Informed Paleo Enthusiasts Often Have

November 11 2015 - You read Mark's Daily Apple every day. Paleo health, nutrition, and fitness folks populate your Twitter feed almost exclusively. You've got several PubMed alerts set up, helping you stay on top of the...

Deconstructing Vitamin D

June 01 2010 - Before phototropic plants began bending toward sunlight, before jellyfish developed ocelli, the light-sensing organs that allow them to distinguish between up (sunlight) and down, before the bikini-cl...

Vitamin D: Loose Ends

June 15 2010 - Okay, I’ll admit it. I may have spoken out of turn a couple week's ago when I tried to completely cover vitamin D in a mere three posts (Deconstructing Vitamin D, Vitamin D: Sun Exposure, Supplement...

Vitamin D and RDA for Children

May 31 2008 - It’s probably of little surprise that we take issue with some of the Recommended Daily Allowance values and how they’re often determined. Case in point: New research published in the Journal of Cl...

Vitamin D: Confounding Factors

June 03 2010 - Yesterday I recommended 4000 IU of vitamin D each day as a good starting point for most people. Though, it’s difficult – nay, impossible – to provide a perfect, universal prescription for vitami...

Primal Challenge Point: Test Vitamin D Levels

February 08 2018 - "In the winter months, when the sun's rays are not intense enough to generate sufficient vitamin D production (this is the case for three to five months per year for locations in North American—you ...

Vitamin D: Sun Exposure, Supplementation and Doses

June 02 2010 - From the presence of vitamin D receptors in our cells and vitamin D factories in our epidermis, along with the central role vitamin D plays in calcium metabolism, immunity, and gene expression, it’s...

Monday Musings: Vitamin D, Toxic Strawberries, New PUFAs Coming Soon

December 06 2010 - A quick look at Google Trends shows a clear, undeniable trend: that of regular folks armed with curiosity, questions, and Internet connections taking their health into their own hands and searching fo...

Dear Mark: Ornish Strikes Again, Vitamin D from Light Boxes, and Kimchi and Cancer

October 02 2012 - Ah, it's good to be back in the saddle again. The challenge was a lot of fun - don't get me wrong - but ultimately both you guys and I come here for the dispensation of musings and information and wri...

Dear Mark: Vitamin D for Babes, Ingredient Bait and Switch, and Kettlebellin’ for Strength or Cardio?

June 29 2015 - For today's edition of Dear Mark, we've got a three-parter. First up is a controversial topic: vitamin D supplements for breastfeeding babies. Do they need it? Can they get enough through mother's mil...

Why Kids Need the Sun

July 01 2014 - This is a guest post from Michelle Fitzpatrick of Happy Paleo Kids. Michelle has worked with special needs children and their families for over 13 years to promote development and mental health. She a...

The Perfect Primal Omelet

September 25 2010 - Breakfast, lunch, dinner, snack time. Hard boiled, scrambled, poached, fried. We’ll take eggs any time of day, any way you want to cook ‘em. But if we had our choice, the omelet just might be our ...

Primal Egg Coffee: The Best Part of Waking Up?

July 24 2013 - Bulletproof coffee has taken the paleo world by storm. Not me, though. Don't get me wrong. I'm all for people dropping grass-fed butter and coconut/MCT oil into their high-quality coffee, blending ...

Tuna Mango Salad with Citrus Poppy Seed Dressing

September 05 2015 - This is a guest post from Kendra Cardoza, author of the blog paleopaparazzi.com. Hey hey! Kendra here. You may know me from my blog paleopaprazzi.com or my IG account where I post #KendrasSuperSal...

I’m Going Into My 40th Year Feeling Healthier Than Ever!

August 30 2013 - It?s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark?s Da...

The Strength to Recover: Wendy’s Powerful Primal Story

August 28 2009 - Where to begin? My earliest memories of food and health started, of course, with family. I remember that my mother was never happy with her weight and was always on some sort of diet. As a little girl...

One Year to Become Truly Healthy

January 03 2014 - It’s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark’...

My Family’s Primal Living Achievements Empowered Me

August 24 2018 - It's Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark's Da...

Keto Was a New Way Of Life

March 04 2019 - It's Monday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark's Da...

Finally Getting Lean and Feeling Excellent!

April 21 2017 - It’s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark’...

I Can Only Show You the Door

April 22 2011 - It’s Friday, everyone! And that means another Primal Blueprint success story. Many thanks to Ronald for sharing how he stepped through the threshold and lost 70 pounds in the process. If you h...

I Feel Better Than I Ever Did In My Life

August 03 2018 - It's Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark's Da...

The Primal Lifestyle Has Given Me a Life Worth Living

July 19 2013 - It’s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark’...

Going Primal Will Change Your Life for the Better!

February 20 2015 - It’s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. If you have your own success story and would like to share it with me and the Mark’...

Dear Mark: More of Your Challenge Questions Answered

January 23 2017 - 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 appa...

Risk Factors for Severe COVID-19: What Makes It Harder for Some and Easier for Others?

August 19 2020 - The way it’s reported, you’d think that susceptibility to COVID-19 severity is equally distributed across the world’s population. But when you compare case and mortality rates between countries,...

Dear Mark: Sun Aging Skin, Veggies as Carbs, and What Breaks a Fast

August 31 2015 - For today's edition of Dear Mark, I'm answering three questions. First up comes from Carlos, who is worried about the effect of sun exposure on skin aging. Is the type of sun exposure I recommend go...

What Breaks a Fast: Supplement Edition

April 17 2019 - Last week, I explored the impact of all the various foods, beverages, and food-like substances people consume while fasting—and hoping to maintain a functionally fasted state in the post, "The Defin...

Dear Mark: Osteoporosis, Body Fat Gain on Caloric Deficit, and Stalling on Primal

April 27 2015 - For today's edition of Dear Mark, we've got a three-parter. First, I try to help out Karson, a guy who's trying to convince his osteoporotic, sun-starved mother to try a few lifestyle interventions th...

The Curious Phenomenon of “Keto Crotch”

March 12 2019 - I have a confession to make: I, Mark Sisson, suffer from keto crotch. It's embarrassing, really. I thought maybe it was just the change in climate moving from Malibu to Miami—the humidity, the he...

Dear Mark: Two Weeks Off Primal, Pili Nuts, Fasting and Micronutrient Deficiencies

August 11 2014 - In today's edition of Dear Mark, I cover three questions from readers. First is from Richard, who's taking his father back to the old country - Italy, to be exact - for a two week vacation to visit th...

Dear Mark: Peripheral Neuropathy, Primal Compromises for Love, and Carbs in Ketosis

March 02 2015 - For this week's edition of Dear Mark, I'm answering three questions. First up, what could be causing a reader's peripheral neuropathy? Could it be gluten, B12 and/or B6 deficiency, diabetes, or inadeq...

How to Ensure Your Final Years Are Good Ones

February 11 2014 - We talk about aging gracefully, but what does it mean? How does one age gracefully? To me, it means ensuring your final years are good ones. Basically, we want to avoid the "regular" maladies of agin...

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

December 07 2015 - 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...

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