This tip is very simple and its one I use myself….sleep more!
When people are on very restrictive diets they tend to incorporate a cheat day into their diet. I'm not a fan of restrictive diets but I am a fan of doing what works for the individual. So in this case I do think a cheat day is a good idea. It will probably keep the person on track which is the most important thing.
However if you are going over you calories by quite a lot it is quite likely you are delaying your progress. For example someone on a diet of 1500 calories a day may have a cheat day on Saturday.