#515 James Krieger - Is Body Fat % Testing Reliable Or Even Useful?
Lift Free And Diet Hard with Andrew CoatesShow Notes
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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