A big reason why is that information is not enough. There are multiple 100B+ industries that are dedicated to driving sedentary and calorie-increasing activities (TV, gaming, fast food, soda, beer). There is far less effort devoted to getting people to exert more physical effort.<p>Think about how the only real way most white collar workers exert ourselves is through &quot;exercising&quot;. Aka moving around for the express purpose of burning calories.