Whether we’re buying a new car or a bagel and a cup of coffee, it’s human nature to want to get the best deal. That’s probably why we have a tendency to eat everything that’s put in front of us. Twenty years ago, that wasn’t necessarily a bad thing–you could probably have cleaned your plate and still had room left over for dessert. But in those two decades, portion sizes–particularly in restaurants, where we want to get our money’s worth–have grown by a lot. And, not surprisingly, so have we: Thanks to our aversion to leaving behind even one crumb of food that we spent our hard-earned money on, obesity rates in the United States have gone from about 15 percent in 1996 to more than 30 percent today.
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