Claire Foy's five-year battle with undiagnosed parasites reshaped her health

Actress Claire Foy has revealed she lived with undiagnosed parasites for at least five years. The condition caused unexplained weight loss and constant hunger, despite eating large meals. Doctors later confirmed the presence of parasites in her body after years of symptoms.

Foy believes she first contracted the parasites while travelling in Morocco. For years, she experienced puzzling health issues, including rapid weight loss even though she ate frequently and in large quantities.

Instead of using antibiotics, she chose to overhaul her diet completely. This meant cutting out caffeine entirely—something she had relied on heavily, drinking up to 15 cups of tea daily. Coffee and caffeinated teas were also removed from her routine.

Her dietary changes went further due to an existing autoimmune condition. Now, she avoids gluten and sugar, maintaining a strict regime at home. However, she allows herself occasional exceptions when dining out.

The adjustment took time, but Foy committed to it fully after her diagnosis. The parasites had gone undetected for years, leaving her health significantly affected before treatment began.

Foy's experience highlights how long-term parasitic infections can remain hidden. Her decision to alter her diet rather than use medication has reshaped her daily habits. The actress now follows a carefully controlled eating plan, though she still makes room for flexibility in social settings.