Can Heat Make You Burn More Fat, How To Run With A Knee Injury, Why I Don't Do Crossfit And Much More!

29 Jan 2026 · 82 min
Episode

29 Jan 2026 · 82 min

0:00

Podcast episode (Ben Greenfield Fitness, ep. 284, 2014-05-28) featuring news flashes and listener Q&A. News flashes cover treadmill training (treadmill can train slightly faster paces), factors that alter caffeine clearance (diet, exercise, supplements, genetics/CYP1A2), a critique of CrossFit (limits for cardiovascular adaptation vs. traditional endurance training), and heat vs cold effects on fat oxidation. Listener Q&A addresses: running a marathon with knee pain (IT band/frontal knee pain — recommendations: soft knit knee brace (GenuTrain), electrostimulation + ice, phenocaine as natural anti-inflammatory, heel lifts/orthotics, water running), efficacy and use of magnesium baths (prefer magnesium chloride flakes, bath temp ~100–103°F, 2–3 cups per bath, drain after use; topical sprays/lotions as alternatives), stevia (Rebaudioside A/RebA vs crude extracts and sugar alcohol blends), menstrual cramp management (reduce inflammation/endocrine disruptors, adaptogens, vitamin D+K, Vitex), and hidden causes of high fasting glucose (insulin resistance/insufficiency, thyroid/adrenal dysfunction, meds).

Questions this episode answers

284

2014-05-28

About 70% (exercise upregulated CYP1A2 and increased clearance by ~70%).

About 18% (broccoli/cruciferous vegetables increased caffeine clearance by ~18% as cited).

Approximately 3–4 mg of magnesium per pound of body weight per day.

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