Current Federal regulations do not require restaurants to provide nutrition information unless they are making health or nutrient-content claims about food or menu items (e.g., “low fat” or “low sodium”) on menus, signs or placards. When such claims are made, nutrient information must be available upon request. Many restaurants provide nutrition information voluntarily for all items, but not all of them do.
For more information, visit FDA's Questions and Answers on the New Menu and Vending Machines Nutrition Labeling Requirements (link is external). If you have additional questions, you may want to contact (link is external) the CFSAN, the division of the FDA that regulates labeling.