The Joe Rogan ExperienceJoe Rogan Experience #1389 - Chris Kresser Debunks "The Gamechangers" Documentary
CHAPTERS
Why respond to The Game Changers: persuasive filmmaking vs scientific rigor
Joe and Chris set the tone: they like James Wilks personally and agree the film is well-produced, but argue it’s persuasive in ways that outpace the evidence. They frame the episode as a careful, evidence-cited critique rather than an anti-vegan rant.
The gladiator opening: “barley eaters” and selective framing
They critique the film’s opening claim that Roman gladiators were vegetarian and therefore evidence for plant-based athleticism. Kresser argues gladiator diets were “prison food” designed to fatten and protect fighters, not a performance-optimized choice.
From “possible” to “optimal”: the film’s leap from anecdotes to universal claims
Chris and Joe agree plant-based diets can work for some athletes, but object to the film’s claim that vegan is optimal for everyone. They emphasize the lack of performance studies demonstrating large strength/endurance gains from vegan diets.
The “vegan honeymoon”: short-term improvements vs long-term deficiencies
Kresser explains why people often feel better after going vegan—especially when coming from a junk-food diet—without proving the diet is superior long-term. He argues performance/health issues may emerge months later via protein quality and micronutrient gaps.
Protein: misleading comparisons and why amino acid quality matters (DIAAS)
They dissect the film’s protein examples (steak vs peanut butter sandwich) as misleading on both quantity and quality. Kresser introduces DIAAS scoring to explain digestibility/bioavailability and why animal proteins typically rank higher for muscle protein synthesis.
RDA myths and real athlete needs: how much protein is actually required?
They argue the film leans on outdated RDA framing that reflects minimal survival needs, not optimal performance. Kresser cites newer methods suggesting higher protein baselines and substantially higher needs for athletes.
Ethics & environment: animal deaths in plant agriculture and scalability questions
They challenge the idea that plant-based eating is “harm-free,” arguing industrial crop systems also kill animals and damage ecosystems. Kresser cites modeling work suggesting removing animal foods has limited greenhouse-gas benefit and raises nutrient shortfalls at population scale.
Greenhouse gases and “apples-to-oranges” accounting in the film
Joe and Chris argue the documentary compares livestock full life-cycle emissions against transportation tailpipe emissions, inflating livestock’s apparent impact. They discuss conventional vs regenerative systems and how methane fits into the biogenic carbon cycle.
Regenerative livestock as an alternative: soil, land limits, and feasibility
They pivot to regenerative grazing as a proposed solution to both environmental and soil degradation problems. The discussion covers land suitability, the “60 harvests left” soil warning, and what systemic changes would be required to scale regenerative practices.
Conflicts of interest, medical CEUs, and the Seventh-day Adventist influence
Kresser notes potential conflicts (e.g., investors tied to pea protein) while emphasizing the deeper issue: treating a persuasive film like scientific education. They criticize doctors being offered continuing education credit for watching the documentary and discuss Adventist historical influence in diet institutions.
Athlete case studies: selective windows, Nate Diaz/Conor narrative, and performance declines
They argue the film cherry-picks athlete narratives while omitting key context: non-vegan athletes labeled as vegan, short-notice fights, and later results. Kresser introduces examples of athletes who tried vegan diets and then reintroduced animal foods due to weight loss, recovery, or performance issues.
B12 and micronutrient reality check: soil/water myths and deficiency data
Kresser disputes the film’s claims that humans historically got B12 from dirty plants/water and that animals require routine B12 supplementation. He explains ruminant vs human B12 physiology and cites data showing much higher B12 depletion rates in vegans and vegetarians than omnivores.
The film’s “experiments”: erections, ‘cloudy blood,’ and why none of it proves causation
They critique the documentary’s made-for-camera tests as non-peer-reviewed, poorly controlled, and designed for shock value. Joe outlines basic experimental design flaws (order effects, confounds), and Kresser notes the absence of robust evidence linking plant-only diets to better erectile function.
Diet wars and “new mechanisms”: heme iron, TMAO, microbiome, and the case for omnivory
They argue that when outcome data for red meat harms are weak, critics pivot to mechanistic claims (heme iron, TMAO, neu5Gc). Kresser reviews counter-evidence, emphasizes dietary context (plants alongside meat), and cites a paleo-style diet study showing improved microbiome diversity similar to hunter-gatherers.
Fake meat vs regenerative systems: carbon accounting and safety questions
They discuss plant-based ‘meat’ products (Impossible/Beyond) as industrial foods with their own environmental and health uncertainties. Kresser contrasts life-cycle analyses showing some regenerative ranches as net carbon sinks, and raises FDA-related concerns about Impossible’s heme ingredient testing.
Closing: where they agree with the film—and why nuance beats propaganda
They end by noting shared concerns with vegans: factory farming, environmental damage, and animal welfare—while disputing veganism as the universal solution. Joe reiterates his frustration with persuasive but selective storytelling and urges evidence-based, nuanced decision-making.
