From Wikipedia and Forbes.com

Self-control is a cognitive process that is necessary for regulating one's behavior in order to achieve goals. The key suggestion from Forbes is the following concepts: 

1.  Meditate

Meditation actually trains your brain to become a self-control machine. Buddhist monks appear calm and in control for a reason.

2. Eat

Eating somthing that provides a slow burn for your body, such as whole grain rice or meat, will give you a longer window of self-control. If your blood sugar is low, you are far more likely to succumb to destructive impulses.

3. Excercise

Getting your body moving for as little as 10 minutes releases GABA, a neurotransmitter that makes your brain feel soothed and keeps you in control of your impulses.

4. Sleep

It links to #2, your brain's ability to control impulses is nil without glucose.

5. Ride the wave

When the impulse you need to control is strong, waiting out this wave of desire is usually enough to keep yourself in control.

6. Forgive yourself

When you slip up, it is critical that you forgive yourself and move on. Don't ignore how the mistake makes you feel; just don't wallow in it. Instead, shift your attention to what you are going to do to improve yourself in the future.

**********************