the short answer
Eating out while dieting means enjoying a restaurant meal without derailing your results, by managing the meal rather than avoiding it. Check the menu and pre-decide, build the plate protein-first with vegetables, watch liquid calories and cooking fats, and estimate portions instead of chasing exact numbers. One meal does not decide your progress - the consistency around it does.
This article is general nutrition information for coaches and their clients, not medical advice. Medical conditions, medications, and clinical questions belong with a doctor or registered dietitian.