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Claire Foy Says Years-Long Gut Parasite Led Her to Quit Caffeine

On the Table Manners podcast, she said unexplained weight loss led to a stool-test diagnosis that she addressed with diet changes.

Overview

  • Foy believes she contracted the intestinal parasites during travel to Morocco and lived with the infection for about five years.
  • She chose dietary measures and other non‑antibiotic treatments, saying the regimen required giving up caffeine entirely.
  • Before quitting, she said she typically drank at least 15 cups of tea a day plus two coffees, and she has remained caffeine‑free since treatment.
  • Foy said the organisms “travel as a pair,” described the experience as “gross,” and confirmed diagnosis through stool testing after persistent weight loss and hunger.
  • Some outlets suggested Giardia based on her description, but neither Foy nor clinicians have identified a specific parasite, and she also noted separate gluten and sugar avoidance for an autoimmune condition.