Title: “I Didn’t Eat for 39 Hours… Then Ran 62 Miles (Fasted) — Carnivore Ultra Runner Interview”

Summary (from the video only; no sponsors, no CTAs):

• Background

• Greg describes discovering the carnivore diet via a relative (his uncle).
• Initial skepticism (“you need fiber/fruit/veg”) shifts after trying it himself.

• Pre-carnivore health/issues

• Long-standing eczema/skin problems treated repeatedly with steroid creams and pills.
• A severe rash two years prior led to more steroids; doctors framed it as “this is who you are.”

• Switching to carnivore

• Adopted a meat- and egg-based diet after conventional approaches failed.
• Within ~2 weeks he noticed significant improvement in skin/eczema.
• Reports steadier energy, reduced food preoccupation, simpler meals, and less stress about recipes.

• Training/running context

• Took up running ~1–1.5 years prior; later got into ultrarunning.
• Began experimenting with fasted training runs (dinner the night before, then run without breakfast).

• The fasted 100K (≈62 miles)

• Entered a 100-kilometer ultramarathon with a plan to remain fasted.
• Did not eat for 24 hours before the start, ate only after finishing.
• Total time without food ≈39 hours (24 hours pre-race + ~15 hours of racing).
• During the race he consumed only water and electrolytes (salt-stick type: sodium, potassium, magnesium).
• Took roughly one electrolyte capsule per hour to prevent cramps/fatigue.
• Reports no GI issues, no energy crashes, and no “hitting the wall.”
• Observed other athletes consuming large amounts of carbohydrates (he mentions ~80–100 g/hour as a common target among ultrarunners) and some experiencing bonks/crashes.

• Perceived effects/observations

• Describes stable, even energy throughout most of the race; acknowledges normal late-race fatigue but no bonk.
• Says he has “never hit the wall” since being on carnivore.
• Notes that conventional endurance advice (high-carb fueling) conflicted with his experience.

• Adaptation period & practical notes

• Warns athletes to expect an adaptation period (possibly 1–2 months of worse performance) when switching diets.
• Emphasizes electrolytes (sodium/potassium/magnesium) and hydration on carnivore/fasted runs.
• Typical pre-run approach outside of races: eat the evening meal, then run fasted the next morning.

• Social reaction & debate

• Fellow runners were surprised he attempted and completed a 100K entirely fasted.
• Mentions critics of carnivore and says he’s open to being a “guinea pig” for testing/measurement in the future.

Referenced papers (as mentioned in the video):
• None explicitly cited; no DOI-identifiable papers referenced by title or author in the conversation.