Episode check · Food and fasting
Modern wheat has much more gluten, the episode says. Seven of eight studies disagree.
We checked five claims from a 36-minute episode on a 10-day elimination diet against 36 studies. Seven of eight studies disagree with the lead, that modern dwarf wheat has much more gluten than older wheat. The studies split on whether 14% of adults are addicted to food. Single studies found anything from 2.78% to 15.6%. One claim has strong support: people who eat as much as they want of unprocessed food lose weight. The studies were mixed on whether gluten makes everyone's gut leaky, and 3 of 6 disagree. Only two studies test whether functional medicine care helps arthritis, the one he cites among them, too few for a badge. His own program numbers and the claim about starch in modern wheat were not checked. The chapters we did not check are in grey.
“If I Could Only Do ONE Thing to Treat Chronic Disease, This Would Be It”
14 chapters · 5 claims checked against 36 studies · 10 chapters not checked yet · checked Oct 13, 2026 Watch on YouTube →
0:19 “There's no better test and no better treatment for chronic disease.” Said on tape, not checked yet.
3:40 “I was seeing dramatic results across the board over and over again in thousands of patients in my practice” Said on tape, not checked yet.
5:29 “And that score, on average, in ten days goes down by 70%.” Said on tape, not checked yet.
6:41 “It was such a radical result that I was seeing for so many patients.” Said on tape, not checked yet.
7:52 “insulin resistance, which affects to some degree ninety percent of the population.” Said on tape, not checked yet.
Sugar and food addiction
“And based on global surveys, fourteen percent of adults and fourteen percent of children are biologically addicted to food.”
Mark Hyman, solo episode.
What 7 studies found
2 agree · 3 partly agree · 2 disagree
The adult studies scatter widely. Two found a share near 14%, including 15.6% of Iranian adults. Two found far less: 5.4% in a Canadian sample and 2.78% in a household sample in Rio de Janeiro. A study in Israel found 12%. A review of samples from the general public found anything from 0% to 25.7%. The scale counts symptoms of addictive eating. It does not test whether the addiction is biological.
Computed from 7 studies that test this point, each judged by two readers, in full. Sources land on both sides. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact words“fourteen percent of adults and fourteen percent of children are biologically addicted to food.”
What 6 studies found
1 agree · 3 partly agree · 2 disagree
One pooled analysis of 22 studies found 15% of children and teens, and 12% in community samples. A pooled analysis adds up many smaller studies. Single studies range widely: 6.91% of Chinese teens, 17.3% of Iranian schoolchildren, and more than a third of teens at two Egyptian youth centers.
Computed from 6 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsCloser look
An online survey of Iranian adults found 15.6%. A household survey in Rio de Janeiro found 2.78%. For children, one pooled analysis found 12% in community samples and 15% across all samples.
Who should try it, and an arthritis study
“We did better on every single metric across the board in terms of outcomes and improvement for those patients than the rheumatology department.”
Mark Hyman, solo episode.
What 2 studies found
1 agree · 1 partly agree
Only two studies test it. The Cleveland Clinic study on tape found small gains in pain and in physical and mental health scores over 12 weeks. Its patients added a functional medicine program to standard care. A trial in Amsterdam tested a lifestyle program for rheumatoid arthritis. Patients' own scores moved slightly in its favor, but not by a significant amount.
Computed from 2 studies that test this point, each judged by two readers, in full. Fewer than 3 sources so far.
Every study and its exact words“Because we're putting people on elimination diet.”
What 5 studies found
5 partly agree
All five studies were mixed. A Swedish diet trial found no clear change in disease activity. A pooled analysis of diet trials rated the evidence as low or very low certainty. Smaller studies saw less pain and better quality of life in some patients.
Computed from 5 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact words19:24 “realize the first few days you're gonna feel like crap. But then, day three, everything starts to get better.” Said on tape, not checked yet.
Gluten, dairy and normal lab tests Lead finding
“Alessio Fasano at Harvard has done the work on this. Everybody, pretty much everybody who eats wheat, it causes some level of leaky gut. It causes some disruption in the intestinal barrier.”
Mark Hyman, solo episode.
What 6 studies found
1 agree · 2 partly agree · 3 disagree
Three of six studies disagree. In 46 healthy adults, changing the gluten dose did not change a standard test of how leaky the gut is. In people sensitive to gluten without celiac disease, permeability was not higher, and in one study it was lower than in the comparison group. One trial found that gluten changed the gut barrier in patients with diarrhea-type irritable bowel syndrome.
Computed from 6 studies that test this point, each judged by two readers, in full. 5 more studies are waiting for a full read and do not count yet.
Every study and its exact words“And the industrial farming of wheat has led to the development of a dwarf wheat. It's not a GMO food, but it's it actually has much higher levels of gluten in it and gliadin proteins, much higher starch content.”
Mark Hyman, solo episode.
What 8 studies found
1 partly agree · 7 disagree
Seven of eight studies disagree. Old landraces and modern varieties had the same total gluten. The semi-dwarfing genes behind modern dwarf wheat tended to lower gluten, not raise it. A review of US wheat data found no clear rise in gluten during the 20th century. The study that partly agrees found more of a main celiac trigger in modern varieties.
Computed from 8 studies that test this point, each judged by two readers, in full. This point is about what a food or product contains. Studies that measure it count toward the badge. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsCloser look
Healthy adult volunteers given different doses of gluten
“Importantly, variations in the gluten dose did not affect the LMR, indicating that overall intestinal permeability was not substantially affected by gluten intake in healthy individuals.”
Int J Mol Sci, 2026 · other primary study · PMID 41828523
People sensitive to gluten without celiac disease
“Interestingly, the LA/MA ratio in GS patients was also significantly reduced relative to DC ( P = 0.0308) (Figure 1 ).”
BMC Med, 2011 · trial or observed group · PMID 21392369
Patients with diarrhea-type irritable bowel syndrome
“Gluten alters bowel barrier functions in patients with IBS-D, particularly in HLA-DQ2/8–positive patients.”
Gastroenterology, 2013 · controlled trial · PMID 23357715
24:06 “unlimited unlimited vegetables except for like potatoes and starchy vegetables.” Said on tape, not checked yet.
26:28 “So be very astute and listen, but only introduce one food category at a time.” Said on tape, not checked yet.
Supplements, fasting and exercise
“And again, you can eat an unlimited amount of food and you won't gain weight. You'll lose weight. And it always sounds crazy, but the science is so clear on this. My colleague David Ludwig at Harvard has published on this over and over again.”
Mark Hyman, solo episode.
What 4 studies found
4 agree
All four studies agree. In an inpatient trial at the NIH, 10 men and 10 women ate as much as they wanted. They lost 0.9 kg on the unprocessed diet and gained 0.9 kg on the ultra-processed diet. A UK trial found both diets led to weight loss over 8 weeks, with more on the minimally processed diet. These trials were small and short.
Computed from 4 studies that test this point, each judged by two readers, in full. 4 more studies are waiting for a full read and do not count yet.
Every study and its exact words32:19 “Tofu and tempeh, even though they're beans, I kind of will allow them because there's no other way to do it.” Said on tape, not checked yet.
35:31 “Now a lot of what's in the book, I learned the hard way through my own body.” Said on tape, not checked yet.
We go through the episode chapter by chapter and pull out each claim. For every claim we can test, two readers read each study in full and mark whether it agrees, partly agrees or disagrees. A fixed rule turns those marks into the badge, the same rule Precis uses on every page. Nobody writes or edits a badge. Chapters we haven't checked are shown in grey, so you can see everything the episode said.
Every quote is 20 seconds or less and opens the episode at that second. This is not medical advice. Talk to your doctor before you change anything.
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