Full Breakdown
Billy Bob Thornton Reveals Rare Blood Type Behind Restrictive Diet
5/10/2026, 9:20:34 PM
Thornton’s Rare Blood Type and Restrictive Diet
On May 5 2026, actor Billy Bob Thornton joined comedian Howie Mandel on the *Howie Mandel Does Stuff* podcast. He disclosed that his AB-negative blood type, together with multiple food allergies, forces a highly restrictive diet, which he described as “very restricted.” He also explained that the condition affects his digestive enzymes and limits his ability to consume common staples such as wheat, dairy, and red meat.
Background: AB-Negative Blood Type and Dietary Claims
AB-negative is the rarest blood group in the United States, representing less than 1 percent of the population according to the American Red Cross. Some alternative-health advocates, notably Dr. Peter J. D’Adamo, claim that type AB individuals have low stomach acid and require specific diets, though mainstream medicine has not validated these links.
Key Figures
- Billy Bob Thornton – Actor who disclosed the condition.
- Howie Mandel – Podcast host.
- American Red Cross – Source of AB-negative prevalence data.
- Dr. Peter J. D’Adamo – Nutritionist associated with the blood-type diet theory.
Data & Statistics
AB-negative blood type accounts for under 1 percent of U.S. residents, making it the least common group. Thornton reports allergies to wheat, dairy, shellfish, pork, and beef, though no prevalence data are provided.
Official Statements & Summaries
Thornton explained that his AB-negative blood type leads to reduced digestive enzyme production, which he believes causes chronic stomach discomfort. He listed prohibited foods—wheat, dairy, shellfish, pork, beef, and related products—and recalled a childhood marked by numerous allergies. His current meals consist mainly of blueberries, gluten-free chips with dairy-free cream cheese, and occasional grapes dipped in Dijon mustard, which he described as a rare treat. The American Red Cross confirms the < 1 % prevalence of AB-negative blood in the United States.
Criticism & Scientific Opposition
Peer-reviewed research does not support a causal link between AB-negative blood type and reduced digestive enzymes. Dr. D’Adamo’s blood-type diet remains controversial and lacks endorsement from major health organizations. Experts warn against self-prescribed diets based solely on blood type or unverified anecdotal evidence.
Conflicting Reports & Gaps
Thornton attributes his digestive problems to his blood type, yet no clinical studies confirm this mechanism. The claim of “less digestive enzymes” lacks citation, leaving a factual gap.
Verbatim Quotes
- “Well, I’m allergic to wheat, dairy. I have type AB-negative blood, which is the rarest type in the world. It’s, like, less than 1% of the population of the world has it,” — Billy Bob Thornton, Actor
- “It means you have less digestive enzymes. That's one of the things that goes along with it. But I just grew up with a lot of allergies.” — Billy Bob Thornton, Actor
- “It was one of the best things I ever had in my lifetime,” — Billy Bob Thornton, Actor
- “I'm going to have some gluten-free chips with some dairy-free cream cheese,” — Billy Bob Thornton, Actor
What’s Next
Thornton plans to maintain his restrictive diet and indicated he may discuss the condition in upcoming interviews or public appearances.
