"One thing Gladwell didn’t mention is that the food industry already knew some things about making people happy — and it started with sugar. Many of the Prego sauces — whether cheesy, chunky or light — have one feature in common: The largest ingredient, after tomatoes, is sugar. A mere half-cup of Prego Traditional, for instance, has the equivalent of more than two teaspoons of sugar, as much as two-plus Oreo cookies."

The Extraordinary Science of Addictive Junk Food - NYTimes.com