• Ryan came to carnivore after teaching nutrition and fitness for almost a decade, stepping away for music and bathroom-remodeling work, and then returning after his own health drifted.
• His first model was the standard fitness-template diet: six meals per day, oatmeal and protein in the morning, lean proteins, low fat, complex carbs, protein snacks, vegetables and meat at night, and casein protein before bed.
• That model looked valid because bodybuilding examples, fitness-model diets, certifications, continuing education, expert voices, client progress, exercise structure, and movement away from junk food all reinforced it.
• The bigger lesson is blind spots: a person can be sincere, educated, paid, certified, and still pass on a model that later turns out to be antibbiological.

Keto, carnivore, and the 60-day test

• After seeing himself heavier in music-video footage in 2022, Ryan returned to nutrition research and heard for the first time that there is no essential carbohydrate.
• In early 2023, he tested keto with salads, avocados, olive oil, vinegar dressing, greens, onions, peppers, lean meat, and eggs; mental acuity, sleep, weight, and GERD improved, but the diet still had cheating and plant-food blind spots.
• In October 2023, carnivore became the first diet model where the pieces all fit: only animal foods, no carbohydrate need, no fiber requirement, and food he already loved.
• For the final 10 weeks of 2023, he consumed carnivore material, stocked beef, tallow, butter, ghee, bacon fat, salt, and other basics, then set January 1, 2024 as a 60-day test.
• Within three weeks, the result was obvious enough that the planned cheat no longer appealed; by six weeks, the diet had become too effective to interrupt.

Health changes during carnivore

• In the first 60 days, energy, mental clarity, recall, work performance, sleep quality, and sleep efficiency rose sharply.
• Chronic GERD had been severe enough to require an endoscopy in 2023, with early Barrett's esophagus damage and an omeprazole recommendation.
• Longstanding SVT, eczema, delayed visual adjustment, panic attacks, digestive issues, joint pain, lower-back pain, and old ACL-related knee soreness were part of the baseline problem list.
• Within six weeks, every symptom was either gone or reduced to a manageable level, and later the remaining issues disappeared.
• From January 1, 2024 to March 1, 2025, Ryan stayed perfectly carnivore for 14 months, reached the best shape and health of his life, and felt as if he had taken 20 years off his age.

The cat lesson

• Nine years earlier, Ryan adopted a FeLV-positive shelter cat that was expected to live about a year to a year and a half, with damaged lungs, bad teeth, bad gums, missing fur, coughing fits, and no meow.
• Researching cats made the diet lesson concrete: cats are obligate hypercarnivores, so the household built a raw-food process with freezer storage, grinding, supplements, omega balance, water, bone, skin, fat, and exact ratios.
• The cat lived nine years and became a full, long-haired, healthy-looking animal, which reinforced the idea that species-specific nutrition can change the course of decline.
• That experience combined with Ryan's own dietary progression made the earlier teaching feel wrong, even though he had not known it was wrong at the time.

Tour relapse and fiber

• After 14 perfect months, Ryan deliberately broke the diet during Japan and Europe touring, eating ramen, takoyaki, convenience-store foods, catering, pizza, sugar, starch, and mixed meals.
• In roughly a month, he gained about 20 pounds, and eczema, heartburn, SVT, digestive distress, and other issues returned.
• Fiber became the clearest example of a blind spot: he had taught that everyone needs fiber, but carbohydrates and fiber are not essential.
• Microbiome-diversity evidence does not settle the issue for Ryan, because large parts of human history and many populations had little or no fiber, and carnivorous animals do not seek dietary fiber except incidentally through prey contents or hair.
• On carnivore, bowel function became better and less frequent, gas and bloating disappeared, and reintroducing plant foods made the digestive contrast unmistakable.

Blind spots in plant-food nutrition

• Nutritional epidemiology can isolate a positive nutrient in a plant, such as quercetin in onions or vitamins in broccoli, while ignoring the negative side of the same food package.
• The crack-cocaine analogy makes the point: a pleasant or beneficial effect does not prove the whole item is good once downstream consequences are included.
• Plant foods bring fiber plus plant-defense compounds such as phytic acid, tannins, oxalic acid, saponins, flavonoids, lectins, phytates, and oxalates.
• Fiber mechanically passes through a digestive tract that cannot digest cellulose, while protease, lipase, and amylase show that human digestion is built around protein, fat, and limited carbohydrate handling.

Digestive biology and anthropology

• Comparing 10 carnivorous animals, 10 herbivorous animals, and humans makes the human digestive system look carnivorous: monogastric, acid-producing, simple, and suited to meat and fat.
• Herbivores require fermentation systems, large ceca, complex stomachs, massive colons, cud-chewing, hind-gut fermentation, or special fecal reuptake mechanisms to extract nutrients from cellulose.
• Humans have very strong stomach acid, similar to carnivores and second only to vultures in the comparison used here, which fits scavenging or meat digestion better than herbivory.
• Human traits such as forward-facing eyes, bipedality, shoulder mobility, hunting ability, and brain development fit a carnivorous anthropology story better than a plant-centered story.
• Red meat is the ultimate human food because it carries all nine essential amino acids, cofactors, fat, collagen, and other animal-source materials in a digestible package.

Animals, species-specific diets, and modern food

• Every animal in nature follows a species-specific diet, while humans are the unusual animal that manufactures food, pays for it, and then loses instinct.
• Wild animals have acute problems such as injury, predation, infection, and harsh conditions, but chronic human-style disease is not the normal species-specific pattern.
• Raccoons near human food waste and dogs eating human-style snacks show the same principle: human food can create metabolic problems in other animals.
• Red pandas look like an exception because they have a carnivore-style digestive system but eat bamboo; habitat loss and lost competitive advantage help explain the mismatch.
• Herbivores graze all day because plants are low-density and hard to extract from, while carnivores eat nutrient-dense meals and rest; humans on carnivore work the same way.

Fuel mixing, diabetes, and practical transition

• Most animals keep a main diet and do not build mixed plates, and mixing carbohydrate with fat creates a fuel-conflict problem like gasoline and diesel in one car.
• The Randle cycle helps explain why glucose enters the blood first and why that should be read as urgent disposal, not proof that glucose is the preferred fuel.
• On carnivore, the triglyceride-HDL-blood-sugar triangle improves, type 2 diabetes has been easy to reverse in Ryan's coaching experience, and type 1 diabetes can need much less insulin.
• Most people should rip the band-aid off into high-fat carnivore, while some may need care around oxalate dumping, medication changes, and the first-month roller coaster.
• The first month can swing between feeling excellent and feeling awful, but once the microbiome changes and ketogenesis takes over, the benefits become obvious.

References

• [00:13] The Biology of Human Starvation — https://doi.org/10.5749/j.ctv9b2tqv
• [00:22] Feline Leukemia Virus — https://www.vet.cornell.edu/departments/cornell-feline-health-center/health-information/feline-health-topics/feline-leukemia-virus
• [00:26] Feeding Your Cat — https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feeding-your-cat
• [00:32] The Gut Microbiome, Aging, and Longevity: A Systematic Review — https://doi.org/10.3390/nu12123759
• [00:32] Diversity of the gut-microbiome related to cognitive behavioral outcomes in healthy older adults — https://doi.org/10.1016/j.archger.2021.104464
• [00:42] The Evolution of Stomach Acidity and Its Relevance to the Human Microbiome — https://doi.org/10.1371/journal.pone.0134116
• [00:50] Enhanced access to anthropogenic food waste is related to hyperglycemia in raccoons (Procyon lotor) — https://doi.org/10.1093/conphys/coy026
• [00:55] The evolution of the gut microbiota in the giant and the red pandas — https://doi.org/10.1038/srep10185
• [00:59] The Glucose Fatty-Acid Cycle: Its Role in Insulin Sensitivity and the Metabolic Disturbances of Diabetes Mellitus — https://doi.org/10.1016/S0140-6736(63)91500-9
• [01:00] The Expensive-Tissue Hypothesis: The Brain and the Digestive System in Human and Primate Evolution — https://doi.org/10.1086/204350