How can eating out be healthy when you are vegetarian and have a nut allergy?

Its not. Eating out is usually very unhealthy and frankly dangerous for patients who have severe food allergies. There are several apps you can download that will give you allergy free eating places but there are not that many. Be careful when going out, speak with the chef or bring your own food along with the Epipen (epinephrine) to be safe.