WILLPOWER is Like a Muscle- So we need to have a plan of action when it gets tired!
Research shows that your capacity for self-control is very much like the muscles in your body - it can grow stronger with regular exercise. But just as well-developed biceps sometimes get tired and jelly-like after too much use, coping with the daily stresses of career and family can exhaust your supply of willpower. When you tax it too much at once, or for too long, the well of self-control strength runs dry. It is in these moments that the doughnut wins.
If you've spent all your self-control handling other challenges, you will not have much left at the end of the day for resisting bad habits. So it's important to think about when you are most likely to feel drained and vulnerable, and make a plan to keep yourself out of harm's way. Be prepared in advance with an alternate activity or a low-calorie snack.
Remember -Don't give up what you want MOST for what you want NOW...