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Trans fat consumption increases cardiovascular risk. In 2006, New York City passed a regulation restricting both chain and non-chain restaurants from using, storing, or serving food containing partially hydrogenated vegetable oil with a total of 0.5 g or more of trans fat per serving. Lunchtime receipt surveys were conducted at fast-food chain restaurants just before and about 1 year after the regulation went into effect. A total of 14,854 purchases (6969 from 2007 and 7885 from 2009) were analyzed.
Participants were evenly divided between men and women. The distribution of customers by restaurant chain type was similar before and after the regulation (hamburger, 53%; sandwich, 28%; fried chicken, 12%; pizza and Mexican food, 4% each). From …