Welcome to Ben Greenfield's Weekly Roundup!
In this weekly post, I share with you my most interesting discoveries of the week, including the latest news on the fronts of fitness, nutrition, health, wellness, biohacking, and anti-aging research. I also recap my upcoming events and special announcements so you can keep up with opportunities to learn, giveaways, discounts, and more!
New Discoveries
The Results Are In… *This* Type of Heat Therapy Is the Best for Your Heart, Immune System & Thermoregulation
If you’ve ever wondered whether an infrared sauna, a dry sauna, or a hot tub delivers the greatest cardiovascular and immune “bang for your buck,” the latest research finally has an answer…
And it’s not what you might expect.
In this head-to-head trial, researchers compared:
- Hot water immersion: 45 min at 104.9°F
- Traditional dry sauna: 3 × 10 min at 176°F (with 5-min cool-downs)
- Infrared sauna: 45 min at 113–149°F
The winner, by a landslide, was hot water immersion. Compared to both sauna modalities, hot water immersion:
- Raised core temperature nearly 3× higher
- Produced the largest spike in cardiac output
- Triggered significant increases in interleukin-6 (IL-6), natural killer (NK) cells, and CD8+ cytotoxic T-cells—creating a substantial immune-activation window
- Created the strongest thermoregulatory challenge (the key ingredient for long-term adaptation)
Infrared saw almost no rise in core temperature. The traditional sauna was solid, but still nowhere close to immersion.
But here's the thing…
Even though hot-water immersion “wins” on pure physiological strain, I’m still sticking primarily with sauna because:
- I like to stretch, breathe, and move during heat sessions.
- I’m not into finishing a session looking like a wrinkled raisin.
- Sauna lets me layer in breathwork, mobility work, and meditative practices that complement the heat.
To sum it up, for maximal heat stress and immune activation, hot water immersion wins. For practicality, habit-stacking, and recovery flow: sauna is still king.
If you want more evidence-based insights on heat therapy, you can explore these additional resources:
- The Latest In Sauna Science: 9 Potent Health Benefits of Sauna, Plus 5 Tips for Getting the Most Out of Your Sweatbox Experience
- Three Ways To Biohack A Sauna For More Heat, A Better Detox & Enhanced Fitness
- Ten Scientifically Proven Reasons I Am Addicted To A Daily Sauna
- Everything You Need To Know About How To Use Heat Exposure To Enhance Performance, Burn Fat, Gain Muscle, And Think Better
- Frog Deadlifts Made Simple: Easy-to-Follow Video Guide from Inside the Sunlighten mPulse Sauna
P.S. I’ve been using the Sunlighten mPulse Smart Sauna lately, and for a limited time, you can save up to $2,200 on their premium models—plus get free shipping—when you use code BEN25 here.
Boundless Bar Is HERE—The World’s FIRST Ketone-Powered Protein Bar ⚡
What you reach for between meals should work with your biology—supporting stable blood sugar, clean digestion, and steady energy that carries you through the day.
That’s why I spent the past year building something I couldn’t find anywhere in the protein bar aisle: a bar powered by goBHB® ketones and clean, functional ingredients that support muscle, metabolism, and long-lasting fuel.
goBHB® is the gold-standard form of beta-hydroxybutyrate (BHB), a ketone that provides clean, steady energy for both your brain and body. It helps stabilize appetite, supports mitochondrial efficiency, and enhances recovery from training.
And instead of the “ketone taste” people dread, we dialed in a flavor profile that actually makes you look forward to eating it.
It’s called Boundless Bar, and now you choose between two indulgent, clean-fueled options:
- Cinnamon Roll (270 calories) blends real cinnamon spice with creamy cashew butter and a touch of honey and monk fruit for a warm, balanced flavor that pairs perfectly with steady ketone energy.
- Vanilla Cheesecake (260 calories) delivers a smooth, rich texture with natural vanilla and clean ingredients that leave you satisfied—without the crash you get from conventional bars.
Both flavors make it easy to stay on track while enjoying every bite, providing you with clean fuel and a smarter, all-day ally.
Ready to experience the power of ketones and step into a Boundless you?
*Here’s* How to Receive Coaching, Workouts & Biohacking Support—with TRIUMPH Coaching
I get it—navigating your health and fitness in today’s world can feel like chasing a moving target. One week, it’s about your macros, the next, it’s wearables and peptide stacks.
When was the last time you had an actual team helping you sort through the noise, guiding you step by step based on your unique biomarkers, goals, and lifestyle?
With TRIUMPH Coaching, you gain access to elite-level support without the guesswork.
We have different coaching plans to meet you wherever you are. Work 1-on-1 with one of my expert coaches, or as part of a group.
Whatever you choose, you’ll be rooted in real-time adjustments and results. If your goals involve optimizing VO2 max, chasing longevity, or just trying to build muscle and mobility right from your living room, we’ve got you covered.
Want to explore your TRIUMPH coaching options?
Fill out our coaching form, and one of our expert coaches will reach out to discuss how to help you achieve extraordinary fitness and peak performance.
My 2025 Holiday Gift Guide Is Here! 25 *Handpicked* Wellness Gifts for Stronger Bodies, Sharper Minds & Joy All Year Long
The holidays are a reminder of what really matters—connection, meaning, and the people you hold close.
And while most gifts fade, the ones that enhance and support health keep giving, because when you give something that nurtures well-being, you’re providing energy, clarity, and a better way to live day after day.
After testing and studying the most effective tools for vitality and longevity, I’ve *handpicked* 25 gifts for you.
You’ll find them all in my 2025 Holiday Gift Guide—each one chosen to help you and the people you love feel your best, this season and beyond.
We’re Adding to the Team & Hiring an Executive Assistant (Full-Time, Remote)
LIFE Enterprises is growing, and we’re looking for an exceptional Executive Assistant to support my team and me across the entire LIFE ecosystem.
This is a high-impact, fast-paced role for someone who thrives on precision, organization, proactive communication, and flawless execution.
You’ll be the operational backbone behind my daily workflow—managing emails, schedules, travel, projects, presentations, and cross-department coordination—while serving as a trusted gatekeeper and strategic support partner.
If you’re detail-obsessed, self-driven, calm under pressure, and energized by supporting mission-driven work in health, performance, and education, we want to hear from you. This is your chance to join a world-class team and help power the LIFE brands from behind the scenes.
Apply now here and become part of the LIFE Enterprises mission!
This Week in Health & Performance: What the Latest Research Says
♂️ Sauna Temps & Dementia Risk: New research shows sauna temperatures above 212°F may increase dementia risk, while 176–210°F for 5–14 minutes appears protective and optimal for long-term brain health (read the study here).
BHB Ketones Preserve Muscle While Dieting: A new paper reveals that supplemental BHB ketones help maintain lean muscle during caloric restriction—providing a metabolic advantage for cutting phases. Now, only if there were a convenient and delicious way to get BHB ketones (hint: there is! Boundless Bar has 1 gram of goBHB in each bar)—more about the study here.
Gluten Intolerance… All Psychological? In a recent study involving IBS patients, gluten only triggered symptoms when participants knew they were eating gluten. Blinded, daily gluten exposure caused no symptom changes, suggesting there's a strong “nocebo effect” (study here).
Nighttime Device Restriction + Morning Light: Among elite athletes, a study found that two weeks of reducing evening electronics AND adding 20 minutes of bright morning light boosted mood and performance—even though their sleep duration didn’t change (study here).
Key Takeaways: From smarter sauna protocols to metabolic support, gluten testing, and light hygiene, small science-backed adjustments can lead to major improvements in brain health, body composition, and daily performance.
Want to dive deeper? Click the links above to explore the research, and click here to follow me on X for all the latest health and performance news hot off the press!
Product Of The Week
::: Save on the Travel Companion That Lets You Thrive (Even During Holiday Chaos) :::
Holiday travel is exciting, but it can also be intense.
Crowded airports, long drives, packed schedules, unfamiliar beds, nonstop WiFi, and constantly shifting environments all take a toll on your nervous system. It’s shockingly easy to feel drained, dysregulated, or just slightly “off.”
But what if you could bring your own energy-boosting, grounding quantum field with you, no matter where the holidays take you?
That’s exactly what the LeelaQ Travel Bloc was designed for. This portable quantum device helps strengthen your biofield, support emotional balance, and keep your system centered amid seasonal chaos.
Leela Quantum Tech’s products are backed by 40+ placebo-controlled studies, showing they can:
- Neutralize the harmful effects of EMFs—even in intense environments like airports, electric cars, and hotel rooms.
- Increase ATP production by up to 29% (i.e., more clean, steady energy).
- Improve cellular recovery, blood health, and circulation within minutes, confirmed in double-blind trials.
Here's how top athletes, biohackers, and practitioners use the Travel Bloc during the holidays:
- Airplanes: Buffer your system against cabin stress + high EMF load.
- Hotels: Upgrade the energetic environment of the whole room.
- Road Trips: Maintain internal balance inside tech-heavy vehicles.
- Family Homes: Bring a calming, coherent field into any environment (even big gatherings).
If you want more calm, more resilience, and more energetic protection during the busiest time of the year, the Travel Bloc is your must-have companion.
Staying grounded, energized, and centered is the ultimate holiday superpower. And there's still time to grab your Travel Bloc before the holidays (and save 10%).
You can use code Ben10 here to save 10% on all LeelaQ products.
Podcasts I Recorded This Week:
Surgical Biohacks, Anesthesia Myths, Future Cosmetic Procedures, and More with Dr. Cameron Chesnut
The Latest Content I Was Featured On This Week:
My Article Feed:
My full article feed and all archives of my articles are here.
Upcoming Events:
Stay tuned for future updates—and you can always keep up with my LIVE appearances by checking out bengreenfieldlife.com/calendar!
This Week's Most Popular Instagram Post:
This Week's Most Popular Tweet:
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Cheers,
Ben
