http://www.zenlabsfitness.com/how-the-8020-diet-can-help-improve-your-health/
What Is The 80/20 Rule?
The 80/20 rule basically states that you should be ‘on’ the plan around 80% of the time, which then allows you time to have freedom and flexibility the other 20% of the time.
Most people when they first start out on a healthy eating plan expect themselves to be 100% healthy 24/7.