A prisoner being held at Champ Dollon in Geneva is taking authorities to the European Court of Human Rights for not supplying him with a proper vegan diet.
The case could have an impact on prison food across the continent.
Switzerland has been asked by the court to respond to the complaint.
The prisoner is a 28-year-old animal rights activist and has been jailed for criminal damage against butcher shops. He says he’s surviving on side dishes, rice salads and bread rolls.
A doctor has diagnosed him with constipation, haemorrhoids and an iron deficiency.
He's refusing to take dietary supplements.
The court ruling could have a major impact in the food served by prisons and hospitals if the court decides veganism is an ethical belief system.
Switzerland has four months to respond.