If possible, try to visit on the weekend. Take a second look during evening hours. Ask your guide about the different shifts and their staff to resident ratios. Breakfast meals tend to be soggy or watery. Bacon tends to be too fatty or frequently burned.
Bread tends to be hard or stale.
Lunch and dinner vegetables are not always cooked enough. If you get the opportunity to speak to one or more of the residents, ask about the food that they eat. If visiting during meal hours try to notice the quality of the food. Ask your tour guide to walk you past the kitchen. Try to observe the workers preparing the food.