Claire Foy was infected by a "gross" parasite which stayed in her system for five years following a trip to Morocco

During an appearance on the Table Manners with Jessie and Lennie Ware podcast, Claire, 41, explained: "Quite a few years ago, I had parasites. Gross ...

"I kept losing weight and I didn't know what was going on ...They the parasites] travel as a pair. I got told by the doctor, gross, absolutely rank. It's disgusting."

The actress went on to reveal the diagnosis prompted her to change her diet and cut out caffeine.

She added: "I basically had to go on this diet and because I didn't want to take really hardcore antibiotics and stuff like that, I took all this little gross stuff, and part of that was giving up caffeine."

Claire also revealed she suffers from an autoimmune condition so she's giving up consuming gluten and sugar in a bid to reduce inflammation in her body.

She explained: "This is my big secret, I feel like I'm in The Traitors or something, and I'm letting everyone know that I'm related to someone.

"I don't actually eat gluten or sugar ... except when I go out for dinner. It doesn't have an impact on me. It's just because I have an autoimmune condition, so I should avoid anything which causes more inflammation."

It comes after Claire previously admitted she feared she wouldn't "make it past 40" after suffering a number of health scares when she was younger.

The actress- who reached the milestone in 2024 - was diagnosed with juvenile arthritis at the age of 13 and four years later she underwent surgery to remove a benign tumour from behind her eye - and Claire said going through serious illnesses at a young age made her think about death and she became convinced she would die young.

She told The Sunday Times newspaper: "Death? The fact we're all on our way out? It's something we just don't want to think about while we're alive. But I have thought about death my whole life. I just presumed that it was going to happen, especially through my childhood."

When asked if that fear has subsided as she's grown older, she added: "My thing was that I was never going to make it past 40 - ever. "I have had many medical things in my life But, yes, I'm still here and someone once told me: 'You know, most people live?'

"They meant most people live quite a long and lovely life. Well, not necessarily lovely. But people do tend to live. That's what humans want to do. We want to survive, and that's quite reassuring."