A Fascinating Fireside Chat with Actor Luke Cook: Cyclical Keto, Ketones, Cold Plunges, Nootropics, Peptides & Living VITAL to the End!

Ben Greenfield

Oct 9, 2025

Episode description

In this special live-recorded episode, actor Luke Cook—known for Chilling Adventures of Sabrina and Guardians of the Galaxy Vol. 2—joins me for a raw, unfiltered conversation about what it really means to live well. Recorded during A Boundless Evening at HUME Los Angeles, this fireside chat brings together curiosity, science, and honest reflections on health, performance, and purpose.

We start with the rhythms of daily life—how I approach mornings, training, and eating while traveling—and why balance beats perfection. You’ll hear how my cyclical keto approach helps me stay sharp and grounded while still enjoying the moments that matter. From movement habits and fasted training to the little environmental tweaks that keep me active throughout the day, we explore how health can be both sustainable and joyful.

We dive into the evolving world of biohacking—cold plunges, nootropics, and stress adaptation—through both skepticism and lived experience.

The conversation goes deeper than supplements or science. We reflect on the connection between discipline and creativity, the balance between ambition and family, and why my personal philosophy centers on healthspan, not just lifespan.

Full show notes: https://bengreenfieldlife.com/firesidechatla/

Episode Sponsors:

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Episode description

We dive into the evolving world of biohacking—cold plunges, nootropics, and stress adaptation—through both skepticism and lived experience.

Episode Sponsors:

Mindsip insights from this episode:

Utilize drinkable ketones for satiety and inflammation reduction

Use drinkable ketones like Ketone IQ before a flight to stay satiated and reduce inflammation, or before a fasted workout for energy without a full stomach.

#satiety

#supplement

Pursue vitality to die happy instead of extreme life extension

Instead of pursuing extreme life extension, a better goal is to live as healthy and vital as possible for as long as possible and then 'die happy'.

#longevity

#philosophy

Explore advanced nootropic blends for sustained focus

For sustained focus beyond coffee, consider specific nootropic blends like Wukiyo's Apex or personalized stacks from companies like Nuotopia.

#focus

#nootropics

Limit high-intensity exercise to 70 minutes weekly to reduce health risks

Research suggests that exceeding about 70 minutes of high-intensity exercise each week can increase health risks like arterial stiffness and plaque formation.

#exercise

#risk

Limit cold plunge duration to 2-3 minutes to preserve workout gains

Short cold plunges of 2-3 minutes are unlikely to blunt workout gains, as studies showing that negative effect used much longer durations of 10-20 minutes.

#cold-therapy

#exercise

Prioritize consistency in fasted morning routine for fat loss

The fat loss benefit of a fasted morning routine (coffee, walk, cold shower) comes from its consistency and ease of adherence, not a proven metabolic advantage.

#consistency

#weight-loss

Implement daily cyclic keto diet for fat utilization and better sleep

Eat almost no carbs during the day to promote fat utilization, then have your carbohydrate allotment at night to aid sleep and stock up glycogen for a morning workout.

#keto

#sleep

Leverage women's superior metabolic adaptation to cold exposure

Despite a higher initial cortisol response, studies show women have a more favorable metabolic adaptation to cold exposure than men.

#adaptation

#cold-therapy

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