Dietary and lifestyle habits have changed considerably since the 1970s including •adoption of a low-fat, high-carbohydrate diet, •increased number of eating opportunities per day, •more meals eating out, •more fast-food restaurants, •more time spent in cars and vehicles, •increased popularity of videos games, •increased use of computers, •increase in dietary sugar, •increased use of high-fructose corn syrup and •increased portion sizes. Any