Not eating (whether as a result of a diet or a too-busy work day) can do more than make you cranky: the more you resist a craving, the less likely you will be able to resist other desires. Translation: Depriving yourself of that slice of pizza you wanted on the way to the car dealer can lead to you buying a red mustang over a sensible Prius.
How to avoid a big oops: In a study published in Psychological Science, subjects felt everything more intensely when their willpower was down -- cold water became more painful, an upsetting film more distressing. So pay attention if you start getting overly frustrated by your coworkers or usual commute. Think, “Have I deprived myself of one too many things lately?” Then, give yourself a treat before heading to that board meeting.