California will become the first state in the nation to require restaurants to disclose major food allergens on their menus starting in 2026. The new law signed by Democratic Gov. Gavin Newsom applies to businesses with at least 20 locations. They will have to list ingredients including milk, eggs, shellfish and tree nuts when they know that they are in their products. Proponents say it will help people with severe food allergies feel safer when eating out. But critics say the law could be costly and burdensome for businesses.