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Since the 1970s, portions have changed significantly throughout the industry. A study conducted by researchers at the University of North Carolina at Chapel Hill reviewed data from three national surveys with more than 60,000 subjects. They found that between 1977 and 1996, portion sizes of fast-food favorites dramatically increased. The data revealed that hamburgers expanded 23 percent, a plate of Mexican fare increased by 27 percent, soft drinks by 52 percent and snacks (potato chips, pretzels or crackers) by 60 percent. These changes were due to increased demand and "value sizing" – getting a bigger bang for your buck. As fast-food portions expanded, America's waistline was doing the same.