James Krieger is one of the most trusted figures in the fitness industry and exercise-science research.
James joins me for a deep dive into body-fat testing, DEXA, measurement error, bone density, weighted vests, physique competition prep, and how we talk about dieting around our kids.
We discuss:
• Whether there is actually a reliable way to measure body-fat percentage
• When body-composition testing can be useful
• Whether DEXA deserves its reputation as the “gold standard”
• The difference between average measurement error and individual error
• Why individual error matters when interpreting your own result
• Whether repeated testing over time solves the problem
• Why testing conditions and consistency matter
• Practical problems with frequent body-fat testing
• BIA devices and the assumptions behind them
• Hydration and body-composition estimates
• Whether knowing your exact body-fat percentage provides meaningful information
• DEXA scans in the conversation around GLP-1s and muscle loss
• Why changes in lean mass need context
• DEXA and bone-density testing
• James’ weighted-vest experiment with a physique competitor
• What happened when the athlete wore additional weight throughout contest prep
• The theory behind the “gravitostat”
• Why results in rodents do not necessarily translate cleanly to humans
• Who might potentially benefit from weighted-vest strategies
• Food environment and behaviour
• Environmental “nudges” that may make eating behaviours easier
• James’ recent physique competition prep
• Time-restricted eating during prep
• How he discussed dieting and strength with his daughters
• Avoiding the inheritance of harmful diet-culture messaging
• Parenting, body image, and social media
• And much more
Follow James:
@james.krieger
CHAPTERS
01:07 The Reality of Body-Fat Testing
03:46 When Body-Fat Testing Matters
06:00 Estimating Body Fat by Eye
08:36 DEXA Versus Other Methods
11:56 Consistency and Testing Conditions
13:26 BIA Pitfalls Explained
15:11 Hydration and Measurement Assumptions
17:23 DEXA and GLP-1 Confusion
20:45 Putting Muscle Loss in Context
23:49 DEXA and Bone-Density Questions
25:55 The Weighted-Vest Experiment
26:40 Weighted-Vest Reality Check
28:48 Rodent Data and the Gravitostat
31:09 Eric Salazar N1 Results
32:16 Who Might Benefit?
35:34 Humans, Rodents, and Food Environment
39:15 Nudges and Environment Design
40:43 Time-Restricted Eating During Prep
43:07 Talking to His Daughters About Strength
46:35 Avoiding Diet-Culture Inheritance
48:51 Parenting and Social Media
51:17 Final Thoughts and Where to Find James
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