Interlude: What Makes a Good Marker of Nutritional Status?

Interlude: What Makes a Good Marker of Nutritional Status?

Author: Chris Masterjohn, PhD January 26, 2017 Duration: 55:13

In this special interlude, I lay down the framework of the five core principles that make a good marker of nutritional status. This is to lay down the framework for a series of podcasts in the future about managing nutritional status for specific vitamins and minerals.

Since these core principles will be referred back to as a general reference in so many other episodes, this one has a special place outside of the sequence and you can reach it at any time with the easy-to-remember URL chrismasterjohnphd.com/interlude.

This episode is brought to you by Kettle and Fire Bone Broth. Use the link kettleandfire.com/chris to get $10 off your first order.

This episode is also brought to you by US Wellness Meats. Head to grasslandbeef.com and enter "Chris" at checkout to get 15% off your order as long as the final price is over $75 and you order fewer than 40 pounds of meat. You can use "Chris" to get the same discount twice.

In this episode, you will find all of the following and more: 37:23 Cliff Notes
09:25 Purpose of this podcast and its place in the upcoming series on managing nutritional status; 11:54 What are the five core principles? 12:05 Principle #1:
We understand its biochemistry and physiology; 15:04 Principle #2: It has been validated against changes in nutritional status; 17:17 Principle #3: Sensitivity; 17:52 Principle #4 Specificity; 19:45 Principle #5: It must be interpreted in the overall context of other markers and the clinical and health history, current signs and symptoms, and diet and lifestyle analysis; 23:20 Example of principle #1: Spectracell vs dp-ucMGP as tests of vitamin K2 status; 27:20 Example of principle #2: 25(OH)D vs. calcitriol; 29:20 Example of principle #3: transferrin saturation vs. ferritin
31:08 Example of principle #4: specificity of 25(OH)D and contexts where its specificity fails; 32:50 Example of principle #5: distinguishing between calcium and vitamin D deficiencies as causes of 25(OH)D by testing PTH, calcitriol, and analyzing the diet and lifestyle; 37:50 Shotgun approaches to nutritional testing; 40:30 Whether to act on leads from shotgun approaches should depend on the risks and other costs of the actions.

Access the show notes, transcript, and comments here:

https://chrismasterjohnphd.substack.com/p/what-makes-a-good-marker-of-nutritional

Chris Masterjohn, PhD, is the Founder and Scientific Director of the mitochondria test Mitome.


Chris Masterjohn, PhD hosts Mastering Nutrition, a podcast that digs into the science of how our bodies work at a fundamental level. The focus here is on mitochondrial health-the energy powerhouses within our cells-and how optimizing them forms the cornerstone of lasting vitality. Chris brings his background as a nutrition scientist and his experience founding BioOptHealth to these conversations, which move beyond generic diet advice. Instead, the podcast explores how individual differences, informed by tools like whole genome sequencing and detailed biochemical data, can reveal personalized paths to better metabolic function. Listeners will hear deep dives into cutting-edge research, practical interpretations of complex studies, and discussions on how to apply these insights in a real-world context. This isn't about quick fixes or trending superfoods; it's about building a coherent, scientifically-grounded understanding of nutrition from the cellular level up. Each episode aims to provide the kind of nuanced, evidence-based perspective that can help you make sense of conflicting health information. Whether the topic is a specific nutrient, a metabolic pathway, or a broader principle of wellness, Chris works to translate dense science into actionable knowledge. Tune in for a thoughtful, detailed exploration of what it truly means to master your own nutritional landscape.
Author: Language: English Episodes: 712

Mastering Nutrition
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