Episode

29 Jan 2026 · 38 min

0:00

Podcast episode hosted by Ben Greenfield featuring naturopathic physician and athlete Dr. Callie Phillips. The episode opens with a host monologue that summarizes a validation study showing consumer heart-rate monitors estimate VO2 max ~6% off but tend to underestimate calories burned (~13%). Special announcements include a $10 Pacific Elite Fitness bookstore coupon and an all-inclusive triathlon training camp in Austin (Jan 18–25). Listener Q&A covers running speed (strength, cadence, barefoot/downhill work), and transdermal magnesium (spray ≈15–20 mg per spray; toxicity risk above ~600 mg/day; practical dosing guidance). The featured interview explains the Paleo Diet (general rules: exclude grains/legumes/dairy; emphasize whole meats, fruits, vegetables, nuts/seeds), discusses the athlete modification (carbohydrates around workout windows only), and clinical experience reporting anti-inflammatory benefits.

Questions this episode answers

"Validation of Heart Rate Monitor Based Predictions of Oxygen Uptake and Energy Expenditure" (Journal of Strength and Conditioning Research).

About 6% error compared to laboratory measurements.

They underestimated caloric utilization by about 13%.

Approximately 15–20 mg per spray (assuming undiluted product).

Around 600 mg daily (loose stool/diarrhea and other toxicity symptoms may occur above this).

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