not just one lunch. Check the food service very,very,very carefully.
Here are my observations, based on my parents’ experience after moving to a (very nice) facility:
FOOD IS IMPORTANT! But also a bit of a problem.
When you first move in, of course, you might not use the institution’s cafeteria. You may prefer to cook all your food for yourself, just the way you are used to at home. But one huge reason you are moving into an institution is that you no longer want the hassles of living in your private home–and one of the biggest hassles of life is shopping and cooking. As you age, you really appreciate the easier life in the facility (whether independent, or assisted living) and you will gradually start taking all your meals the easy way….from the cafeteria.
It’s a funny thing about people: when you are in your own house, you don’t mind having a menu which is boring and standard–say, 5 or 6 meals that you make regularly, and repeat over and over again during a month. But if you go out to eat, and you find that you’re limited to only 5 or 6 items on the menu, you get tired of those items real quick.
The food service at your institution may be very good.. It may resemble a nice little cafe, or a restaurant chain like Panera. But try to imagine eating at Panera 3 meals a day, every day, for 10 years. You’d get real tired of it, wouldn’t you? (Seriously–try this as an experiment: For a week, pick a nice restaurant that you like , and eat there every single day. You will get tired of it, trust me.)
So when checking out potential places to move, don’t just enjoy one nice lunch while the sales guide chats you up. Eat there more than once. Or, if that gets awkward (after all, they are not a restaurant open to the public, and they won’t welcome you to eat there multiple times) then check out the food very thoroughly, to see that it matches your tastes.
On the day that you take the tour and eat there, don’t just look at the hamburger or salad that you ordered; look at each and every item on the menu. Even if that means walking back and forth along the cafeteria line several times looking like an idiot, or peeking rudely over the shoulders of complete strangers to see what they are eating. Look at all the items on the menu, and which items you would want to eat—every day for the rest of your life.
Then ask for a printed copy of the menu for the entire week, and read it very very carefully. Check the items which change every day, or are only offered once a week, etc. Take a pen and make a list of which items you like. List any other dishes that you currently eat at home but are not on the menu–things that you would miss.
My point is that food service affects your mood. If you find it boring, and even a bit unpleasant to walk into the cafeteria; If you say to yourself, “oh, shit, once again, there’s nothing here that appeals to me right now” –then you get irritated, and you start to regret that you moved into the facility.
Of course, that happened to you all the time at home, before you moved, right? 
I do it all the time–open my refrigerator and wonder, “Geez., what is there in here that I want to eat? Nothin’ really… Should I heat up the leftover meal from last night? naw…too boring. Maybe make a nice salad, slice up lettuce and carrots and onions and tomatoes, grate some cheese? naw..too much work. Hell, I’ll just make a lousy sandwich, just spread some mayonaise on a slice of bread and dump can of tuna on it…yeah, that’s easy, I’ll do that.”
My point is that when you have control over your meals, and you make your own choices–then you feel in control of your life, and you don’t mind eating a poorly-prepared tuna sandwich. But when somebody else controls your meals, and serves you a poorly-prepared item….you get angry, and feel that you are being forced to eat something you don’t want, and you do not have control over your life.
So check out the food service very carefully, and compare each institution you visit.