This is an excellent way to judge plate portions. Portion control is critical to long term weight control and optimized health. Check out my book on the subject. " the Pastorella Family Health Basics Weight Loss System"
Step Know your stuff. You need to know your portion sizes, how many calories to eat in a day, the best kinds of foods to eat, and how much your work out/exercise is working off. Keeping a food journal is key, once you know what you eat you can plan it