Reset Your Body's Metabolism for FASTER Weight Loss & LESS Hunger In An Era Of Ultraprocessed Foods, With Dr. Jason Fung.
Boundless Life
Ben Greenfield
4.6 • 5.3K Ratings
🗓️ 28 February 2026
⏱️ 72 minutes
🧾️ Download transcript
Summary
Full Show Notes: bengreenfieldlife.com/hungercode
On this episode, I got to geek out with Dr. Jason Fung and unravel why calorie counting alone doesn’t explain our weight struggles. Dr. Fung used jaw-dropping stats—like nearly identical calorie consumption between nations with wildly different obesity rates—to illustrate how hormones, digestion, and even the microbiome play a much bigger role than just numbers.
We also broke down the three types of hunger—homeostatic, hedonic, and conditioned—and explored how ultra-processed foods hijack our biology. Dr. Fung shared that ditching those foods is his top strategy for conquering hunger, while I revealed how staying busy and using GLP-1s can help curb appetite during fasting or travel.
Dr. Jason Fung is a physician (kidney specialist), researcher and New York Times best-selling author currently practicing in Toronto, Canada. trained in Los Angeles and Toronto and currently practices as a nephrologist (kidney specialist). His books, including The Obesity Code, The Complete Guide to Fasting, The Diabetes Code and The Cancer Code have challenged conventional thinking about these diseases, and introduces dietary strategies to manage them.
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Transcript
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| 0:00.0 | My name is Ben Greenfield, and on this episode of the Boundless Life podcast, do you want to know how to stop hunger in its tracks, control how many calories you're eating, and understand how to really reset your body's thermostat for better hunger management, better weight loss, then keep listening. |
| 0:17.2 | I'm interviewing Dr. Jason Fung, author of The Hunger Code, and all the show notes are at Ben |
| 0:22.7 | Greenfield Life.com slash hunger code. This one is great if you just can't seem to stop eating. |
| 0:30.0 | All right, here we go. Welcome to the boundless life with me, your host, Ben Greenfield. |
| 0:36.1 | I'm a personal trainer, exercise physiologist, and nutritionist, and I'm passionate about |
| 0:40.7 | helping you discover unparalleled levels of health, fitness, longevity, and beyond. |
| 0:51.3 | Let's talk about your noggin, about your brain health. |
| 0:55.0 | I know a lot of you struggle with it. |
| 0:57.0 | I do sometimes, especially when I'm traveling, and brain fog or mental fatigue, even after a good night's sleep, is something that happens. |
| 1:04.0 | We're talking forgetting names, details, why you walked into a room, struggling to focus on tasks that used to feel effortless, getting frustrated |
| 1:12.6 | easily, that's a big one, relying on coffee and energy drinks to just get through the day and those |
| 1:17.4 | 18 different neutropics that you take, worrying that your memory isn't as sharp as it once was. |
| 1:22.4 | And a lot of these problems arrive when your brain-derived neurotrophic factor, that's BDNF, |
| 1:27.3 | when your BDNF levels naturally |
| 1:29.0 | decline with age. Plus, when oxidative stress starts dampening and damaging your neurons. |
| 1:34.1 | So over time, that weakens what's called synaptic plasticity. That's the foundation of memory |
| 1:37.5 | and focus and learning. So what level up health, one of my favorite companies that creates these |
| 1:42.2 | amazing clinically backed peptide and botanical formulations that you take orally has done is they've created a process |
| 1:49.1 | to boost BDNF, grow new neural connections, sprout them like miracle grow, and protect against |
| 1:55.3 | cognitive decline. |
| 1:56.6 | They have stuff in there to enhance blood flow to strengthen memory, to improve learning, |
| 2:00.6 | to protect neurons from oxidative stress, to stabilize energy metabolism to slow brain aging. |
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