The Simple Nutrition Rule That Makes Weight Loss Sustainable   Many celebrities such as Giselle Bundchen and Miranda Kerr Swear by the 80/20 diet. The 80/20 principle for healthy eating is one of the easiest ways to reach and maintain a lean body. This simple plan requires that you eat a clean diet 80% of the time and then allow for a few more “fun foods” 20% of the time. If you love coming to Studio Physique because your goal is to achieve long, lean muscles, then GIRL (or GUY!) this post is