Eating out?

I'm not sure what the question is exactly but surely you would choose what you enjoy?

If the place has nutritional information online look it up in advance. If they do not you can look up similar dishes from othsr restaurants to get an idea.

If you want lower calorie watch out for things like portion sizes, breaded, fried, cheese, bacon, creamy sauces or gravy, salad dressings, nuts, seeds, guacamole, sugary foods, drinks. Try a thinner crust pizza. Eat more vegetables. Choose lower or no calorie drinks. Use some common sense and don't get a bacon triple cheeseburger, huge fries, giant soda pop and a peanut butter shake and expect it to be a low calorie meal.

If portions are large you might share with someone else or pack up half to take home for the next day.
Eat something you are going to like. Don't be miserable with a salad with no dressing and a glass of water. It is possible to have a decent meal for 400-600 calories at a restaurant.
If it is not every day you might bank some calories for the day by eating slightly less a few days, eat lighter the rest of the day or exercise a bit more.
You might just have a maintenence calorie day.

Another trick is to order a to-go box to come when your meal is delivered. Then before taking a bite, put half into the box. I've got a strong psychological urge to finish everything on my plate (thanks Mom) and this lets me do so with half the calories.