6. You’re super irritable.
If you’ve ever waited too long before eating dinner, you know what “hangry” means—that unpleasant combination of being so hungry you get angry. The same thing happens when you’re restricting calories too severely, Young says.
In fact, some research suggests acts of self-control (like adhering to a strict diet) are associated with angrier behavior. If you’re trying to lose weight, you want to limit calories just enough to slim down, not change your mood.