It is usually difficult to understand serving-sizes. That’s the reason why in this article we will provide you a simple portion size guide which you can use every day. All of us may remember studying about the food-pyramid during our middle school however, at the present the USDA had made some minor “tweaks” to the model guide whom we originally learned in school. It’s called the portion size guide. This method is much more flexible since it includes various factors such as age, gender and activity levels into consideration. In addition, it provides you with suggestions on “portion-size” of the food and not focusing on the serving-size alone which means that it examines the weight of the food, and correlates it to daily caloric needs of the person.