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What is Vitamin D?

June 01 2010 - Before phototropic plants began bending toward sunlight, before the bikini-clad beach denizens began tanning en masse, and before the first house cat followed the sliver of sunlight around the room al...

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: 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: 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...

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: 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...

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...

Don’t Let “D” Stand for Deficiency

October 18 2008 - Remember how we're always going off about the importance of getting enough vitamin D in your life? How outdoor activity - and vitamin D producing sunlight - is important for any Primal Blueprinter? It...

What is Vitamin D?

June 01 2010 - Before phototropic plants began bending toward sunlight, before the bikini-clad beach denizens began tanning en masse, and before the first house cat followed the sliver of sunlight around the room al...

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: 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: 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: 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: 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...

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...

Don’t Let “D” Stand for Deficiency

October 18 2008 - Remember how we're always going off about the importance of getting enough vitamin D in your life? How outdoor activity - and vitamin D producing sunlight - is important for any Primal Blueprinter? It...

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...

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...

Dear Mark: Vitamin K2 and Microworkouts

August 13 2019 - For today's edition of Dear Mark, I'm answering questions about vitamin K2 and microworkouts. The last two posts on both topics garnered a number of good questions. What's the best dose of vitamin K2?...

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...

Study: The Link between Body Temperature and Physical Activity

November 18 2021 - I used to offer extended commentary on new research in a weekly series called "Monday Musings." I'd cover and summarize a study or two or three, give some commentary, and open it up for questions from...

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...

Dear Mark: Your Challenge Questions Answered

January 16 2017 - 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.) Fir...

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 ...

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 ...

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...

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). ...

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...

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...

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...

9 Factors That Influence Testosterone Levels

September 06 2017 - In the last several weeks testosterone has come up on a pretty regular basis. I've written about it before, of course, but there's something about the novel elements (e.g. solar irradiation for certa...

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...

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...

What is Vitamin D?

June 01 2010 - Before phototropic plants began bending toward sunlight, before the bikini-clad beach denizens began tanning en masse, and before the first house cat followed the sliver of sunlight around the room al...

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: 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: 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...

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...

Don’t Let “D” Stand for Deficiency

October 18 2008 - Remember how we're always going off about the importance of getting enough vitamin D in your life? How outdoor activity - and vitamin D producing sunlight - is important for any Primal Blueprinter? It...

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...

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...

Salmon Burgers

August 29 2022 - Salmon burgers are the perfect dinnertime meal. Not only are they nutritious, but when made on the stovetop are a quick meal to enjoy with the entire family. Plus, salmon includes vitamin D3, B-vitami...

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 ...

Modifying Your Plant-Based Diet

August 10 2022 - I'm not a vegetarian (although my wife and son have dabbled with it). I'm certainly not a vegan. I don't recommend that anyone eat a totally plant-based diet for health reasons. Animal foods are too g...

Sauerkraut Benefits (with an Easy Homemade Sauerkraut Recipe)

June 19 2020 - Although fermented cabbage has been around in some form or another since ancient times – Roman author Pliny the Elder wrote of the stuff in the first century A.D. – modern methods for making sauer...

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...

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 ...

Make it a Primal Thanksgiving!

November 24 2008 - Given it’s Thanksgiving week, we thought we’d devote Monday to the big menu. (Check back tomorrow for this week’s Dear Mark!) Yup, we’re taking on the mother of all carb-laden holidays, and we...

Dehydrating Food at Home: How to Get Started

April 26 2022 - It’s easy to see why food preservation would have been critical to our ancestors’ survival. Being able to store food to eat later meant they were protected against unsuccessful hunts and less-than...

The Many Uses of Almond Meal

December 22 2008 - As you might recall from our pie and cracker recipes, and Son of Grok's pizza recipe we like to use almond flour or almond meal as a foundation for Primal baking. It has a similar consistency to tradi...

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...

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’...

Drug Free for the First Time in Five Years

November 05 2010 - During this year's 30-Day Challenge I put a call out for Primal Blueprint Success Stories. Dozens upon dozens were sent in. If you're looking for a bit of insight into how others have transitioned to ...

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...

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...

Paleo Thyroid Solution Success Story: Cara Haun

September 16 2016 - It’s Friday, everyone! And that means another Primal Blueprint Real Life Story from a Mark's Daily Apple reader. This week's featured testimonial is one of many success stories spurred by Primal Blu...

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’...

I Didn’t Get a Migraine That First Week. Or That Second Week. Or Ever Again.

July 07 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’...

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...

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...

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...

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...

Dear Mark: Your Challenge Questions Answered

January 16 2017 - 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.) Fir...

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...

9 Signs You Aren’t Digesting Fats and What To Do About It

May 06 2020 - If you're on a high-fat ketogenic diet and running on a fat-based metabolism, you need access to fat. Some of it comes from your own body, but not all. A good portion of your body's fuel will come fro...

Dear Mark: Sun Beds, Skipping Breakfast, Cooking with Essential Oils, and Glycerol

December 19 2011 - It's Monday, which means it's time for another round of Dear Mark questions and answers. This week I'm answering four reader inquiries. First, I discuss the suitability of tanning beds, and try to giv...

Dear Mark: Potato Diet, Lean Gains, EVOO/Butter/Ghee, Exogenous Ketones, and Early IFing

June 18 2018 - For today's edition of Dear Mark, I'm answering several questions drawn from the comment board of last week's post on fasting vs carb restriction. First, how do I square my recommendations with the su...

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