Most of us are aware of the obesity epidemic that is plaguing our youth. There are a whole host of reasons why this is. One reason is that our concept of what constitutes a portion of food has drastically changed. Food portions have gotten much larger, more than double in many cases, in the past 20 year. In this lesson we use actual data collected from the National Heart, Lung and Blood Institute website to explore these changes in a spreadsheet (I use MS Excel) . Depending on the age and abilit