Ketogenic and Carnivore (Lion) Diets for Inflammatory Bowel Disease and Rheumatoid Arthritis
Effectiveness and Efficacy of a Ketogenic or Carnivore (Lion) Diet for Quality Life and Symptom Burden in Individuals With Symptomatic Inflammatory Bowel Disease or Rheumatoid Arthritis: A Randomized Controlled Clinical Trial
Fuller Research Foundation
160 participants
Feb 17, 2026
INTERVENTIONAL
Conditions
Summary
This study is a randomized controlled clinical trial evaluating whether two therapeutic dietary approaches - a ketogenic diet and a carnivore (lion) diet - can improve quality of life, reduce symptoms, and influence measures of disease activity in adults with inflammatory bowel disease \[ulcerative colitis and Crohn's disease\] (IBD) or rheumatoid arthritis (RA). Participants will be randomized into one of three groups: 1) Ketogenic Diet, 2) Carnivore (Lion) Diet or 3) Wait-List Control. Participants randomized to a dietary group (ketogenic diet or carnivore diet) will be provided guidance on their specific dietary therapy and answer questions about their symptoms and quality of life at different intervals over a 24 week period. Participants will also complete laboratory testing at different intervals to assess for changes in nutritional status, cardiometabolic health and markers of immune activation and inflammation. Participants initially placed on the wait-list group will be asked similar questions about their symptoms and quality of life and complete the same laboratory testing as participants in a dietary group. Participants on the wait list will then be compared to participants following a specific dietary pattern to assess for any differences between the 2 groups. After 12 weeks, participants on the wait list will be randomized to a dietary group (ketogenic diet or carnivore diet) and followed in a similar fashion for an additional 12 week period.
Eligibility
Plain Language Summary
Simplified for easier understanding
This summary was AI-generated to explain the trial in plain language. It is not medical advice. Always discuss eligibility with your doctor before enrolling in a clinical trial.
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Interventions
The ketogenic diet is a high fat, moderate protein, and very low carbohydrate nutritional approach designed to shift the body's primary energy source from glucose to ketones, compounds produced in the liver from fat metabolism. This state of nutritional ketosis typically occurs when carbohydrate intake is restricted to 20-50 grams per day, though the exact threshold varies based on individual factors such as muscle mass, insulin sensitivity, and physical activity. Participants will receive nutritional guidance for the ketogenic diet in a virtual setting via both synchronous and asynchronous engagement including group telehealth sessions, dietary education guides/food lists, quantitative sample meals plans and ongoing messaging capacity with the clinical team for the duration of the dietary intervention.
The carnivore (lion) diet is a more restrictive form of a ketogenic diet that is intended as an elimination dietary protocol composed exclusively of ruminant meats (beef, lamb, bison, venison, goat, moose, elk), salt, and water. A broader carnivore diet includes more animal foods such as additional meats, fish, eggs, and some dairy. It excludes, however, all plant foods including vegetables, fruits, grains, legumes, nuts, seeds, or plant-derived oils. Participants will receive nutritional guidance for the carnivore (lion) and the broader carnivore diet in a virtual setting via both synchronous and asynchronous engagement including group telehealth sessions, dietary education guides/food lists, quantitative sample meals plans and ongoing messaging capacity with the clinical team for the duration of the dietary intervention.
Locations(1)
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NCT07524244