It's hard to experiment with caloric intake, and what works best, because (at least for me), we all want weight loss NOW, and the thought of UPPING calories to lose weight contradicts everything we think is true about losing. However, while I've never had the patience or courage to do this experiment on purpose, I have noticed that if I'm stuck at a plateau, and I travel or otherwise eat a bit more than usual (I usually get a bit lax with calorie counting when I'm not at home), the scale never fails to budge within a week of this 3/4/5 day break in the restriction. So I suspect, though again I haven't taken the time to prove it, that upping calories, at least every now and again, is actually a good thing to do. Still make healthy food choices, but more of them. And if you try to do this, don't weigh yourself DURING the higher-calorie days! You may add some water and food weight, and it may be too discouraging to continue if you think you're gaining (even though you know you're not). Wait a week, then get on the scale and see what happens.
We all DO know that it's possible to eat so little that your metabolism slows way down and so does the scale. So the opposite would seem to be true - eat a bit more to get the scale moving again, and also to make sure you're getting all the energy and nutrients you need.
Them's my thoughts