343: What is Fibermaxxing and Why is My Grandma Talking About It?
Get Leaner & Live Longer
Nate Palmer
4.9 • 300 Ratings
🗓️ 20 April 2026
⏱️ 20 minutes
🧾️ Download transcript
Summary
Fibermaxxing: Both Sides of the Argument
97% of men in the US don't meet their daily fiber requirements. Not most men. 97%. And yet Gen Z is suddenly obsessed with maximizing fiber intake, at the exact same time that colon cancer rates in adults under 50 are rising at 3% per year. That timing isn't a coincidence.
In this episode we break down where fibermaxxing came from, what the science actually says, and where the carnivore counter-argument holds up and where it falls apart.
What we cover:
- What fibermaxxing actually is, and why the 30-plants-a-week movement behind it traces back to a 2018 study involving over 10,000 citizen scientists
- The fiber gap: 97% of men and 90% of women aren't hitting daily targets, so "maxxing" sounds extreme when most people are just trying to close a massive deficit
- Steph Grasso, the RD with 2M TikTok followers who claimed 2024 as "the year of fiber" and why her comment section is a perfect case study in how people misread their body's response to fiber
- Why "fiber bloats me" is almost always a transition problem, not a verdict, and the ramp-up approach that fixes it
- Butyrate: the mechanism most people have never heard of. Fiber feeds bacteria that produce it, and it's the primary fuel source for your colon cells with documented anti-cancer properties
- The colon cancer data in young adults: people born around 1990 are twice as likely to get colon cancer and four times as likely to get rectal cancer as those born in 1950
- The Hadza tribe research: one of the last hunter-gatherer populations on earth, eating roughly 150g of fiber a day, with 40% more gut microbial diversity than Americans
- The carnivore counter-argument, taken seriously: the IBS and Crohn's evidence is real, and the question of why you'd prioritize something indigestible deserves a real answer
- Why Gut Reset exists: prebiotics build the foundation before probiotics can take hold, and skipping that step is why most probiotic attempts don't stick
- The Chris Reed connection: how starting each meal with a fibrous food helped him reverse his diabetes markers, and why it's the simplest application of this science
Referenced in this episode:
- Chris Reed diabetes reversal episode
- Gut Reset
- Prof. Tim Spector / ZOE: zoe.com
- Steph Grasso: @stephgrassord on TikTok
- Netflix: Hack Your Health
- American Gut Project (2018)
The takeaway: You don't need to chase 100 grams a day. But if you've been avoiding fiber because it bloats you, you likely quit before your gut had a chance to adapt. Give it four weeks done right, and see what happens.
Transcript
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| 0:00.0 | Hey, welcome back to get leaner and live longer. Today, we're going to dive into a topic that's been trending on TikTok, but it's a trend that actually has some real science behind it. It's also as a contingent of people who think that it's completely unnecessary as well. It's called fiber maxing. Have you heard of it? It's all over TikTok. It's being covered by the New York Post and places like good housekeeping as well. |
| 0:21.4 | And Pepsi just spent $2 billion chasing it down. |
| 0:24.5 | So check that out. |
| 0:25.8 | We're going to break down where it came from, who's pushing it, why the data is kind of alarming, and what the carnivore crowd has to say about it. And then I'll tell you where I land on it because I've spent my time in the low carb and carnivore crowd, |
| 0:35.8 | also doing a lot of research around nutrition, talking to people who are registered dietitians and nutritionists and experts in this |
| 0:40.7 | area. |
| 0:42.0 | And my take isn't maybe what you'd expect from either side. |
| 0:46.0 | So first of all, welcome to get leaner and live longer. |
| 0:48.7 | If you're interested in hearing a little bit more of fiber maxing and seeing if fiber |
| 0:51.3 | is an essential necessary part of your diet, then stick around because we're doing this. So what is fiber maxing? First of all, that is a silly |
| 0:59.0 | word. It is Gen Z Internet slang. They do with everything, though, like looks maxing, sleep |
| 1:04.1 | maxing. Now, I guess, fiber maxing. It means deliberately maximizing your daily fiber intake, |
| 1:09.8 | usually like well beyond the standard |
| 1:11.4 | 25 to 38 grams per day that the USDA recommends. |
| 1:16.4 | The goal is optimizing gut health, blood sugar regulation, and metabolic function. |
| 1:21.8 | So here's the stat, though, that kind of got me is that 97% of men in the U.S. |
| 1:27.0 | don't meet their daily fiber requirements. |
| 1:29.0 | Not like most men, but like 97%. And 90% of women. This is basically universal. And no one is, |
| 1:36.7 | no one's fiber minning, most such fiber maxing. So before we even get to the maxing side, |
| 1:43.5 | like the average person isn't even the ballpark of like what a lot of requirements would consider adequate. Now, in the carnivore and low carb space, a lot of people will say that that's not even necessary. You don't even need to be having any fiber at all. So let's talk a little bit about both sides of those arguments, where they're coming from, and then maybe what's the next step for you, what's right for you? |
| 2:03.3 | So the intellectual backbone of this trend, though, traces back to a 2018 study from the |
| 2:08.2 | American Gut Project. |
... |
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