The phrase "to have dietary restrictions" means that an individual has certain food limitations or requirements due to health, religious, cultural, or personal reasons. This could include being allergic to specific ingredients, following a particular diet such as veganism or gluten-free, or having medical conditions that require them to avoid certain types of foods. People with dietary restrictions need to be mindful of what they eat and may have to plan their meals carefully to ensure they get the necessary nutrients while adhering to their limitations.