Thornton spoke openly on the podcast about assuming as a child that “everybody felt like s— after they ate,” unaware his symptoms stemmed from allergies and rare blood. The revelation came amid promotion for his Paramount+ series Landman. In the May 5 episode of Howie Mandel’s podcast, Howie Mandel Does Stuff, the 70-year-old Landman actor discussed the rare reason for his restrictive diet after the comedian host, also 70, brought up a story about a snack their sons once shared.
Thornton’s Health Revelation
Thornton explained his AB-negative blood, the rarest type worldwide per Red Cross data, reduces digestive enzymes for him. This compounds allergies to wheat and dairy, forcing major dietary changes. He now skips red meats and shellfish entirely, reshaping his eating habits over decades.
The actor described growing up eating everything despite discomfort, normalizing poor post-meal feelings. Only later did he connect symptoms to biology. Thornton called it a “lifelong health battle,” blending allergies with blood type effects.
Howie Mandel says people claiming they have “a little OCD” bothers him more than anything.
Because when you actually have it badly, it’s “excuse my language, f*cking torture.”
Mandel’s OCD was so severe that it nearly destroyed his marriage. His wife gave him an ultimatum: get… pic.twitter.com/yhHkOJLkZv
— The Vigilant Fox 🦊 (@VigilantFox) May 12, 2026
Key Facts on Condition
AB-negative blood affects under 1% of Americans, per the Red Cross. Thornton attributes low stomach acid and enzyme shortages to it, echoing unproven “blood type diet” ideas from Dr. Peter D’Adamo. No peer-reviewed studies confirm blood type directly dictates digestion, though individual allergies do.
His restrictions include:
-
No wheat or dairy products.
-
No pork, beef, or similar meats.
-
Avoidance of shellfish.
Thornton gets creative with snacks like unconventional pairings to stay compliant.
Actor’s Background
Billy Bob Thornton, Oscar winner for Sling Blade (1997), has a storied career in films like Fargo and TV’s Goliath. At 70, he stars in Landman, a Taylor Sheridan oil drama. Health talks are rare for the private star, making this disclosure notable.
He grew up in Arkansas, facing early allergies but pushing through. Recent roles demand stamina, likely prompting his candor.
Expert Views
Hematologists note AB-negative’s rarity but stress no established digestive link. Nutritionists like those citing WebMD say low stomach acid claims from blood type diets lack robust evidence. Allergists confirm wheat and dairy sensitivities affect millions, warranting restrictions.
Dr. D’Adamo’s theory suggests AB types handle mixed foods poorly, aligning with Thornton’s experience—but it’s not medically endorsed.
Creative Diet Adaptations
Thornton shared enjoying odd snack combos born from limits, like non-dairy, wheat-free mixes. He emphasized adaptation over complaint, fitting his resilient persona. This approach helps maintain health amid a busy schedule.
What Happens Next
Thornton continues Landman filming, with season 2 potential. Expect more health discussions if the podcast gains steam. Fans may seek AB-negative diet tips, though experts urge medical advice over celebrity anecdotes.
Medical communities could address blood type myths if buzz grows.
FAQ
What rare health condition does Billy Bob Thornton have?
AB-negative blood type, less than 1% of people, which he says lowers digestive enzymes.
Why can’t Billy Bob Thornton eat wheat or dairy?
Allergies cause issues, combined with his blood type’s supposed enzyme shortage.
Is there science behind blood type affecting diet?
Theories exist but lack strong studies; allergies are proven triggers.
What does Billy Bob Thornton eat now?
Avoids wheat, dairy, red meats, shellfish; enjoys creative snacks.
Thornton’s story highlights how rare traits shape daily life, sparking wider talks on hidden health hurdles. His matter-of-fact style underscores resilience in Hollywood’s glare.
Also Read | Jason Wahler Reveals His OCD Struggles in the 1990s



