"A study released April   suggests restrictions on heartdamaging fats in restaurant food may have helped prevent heart attacks in several New York counties. Photo Dima Gavrysh  AP    Chicago  Local bans on arteryclogging trans fats in restaurant foods led to fewer heart attacks and strokes in several New York counties a new study suggests.    The study hints at the potential for widespread health benefits from an upcoming nationwide ban the authors and other experts say. The U.S. Food and Drug Administration in  gave the food industry until next year to eliminate artificial trans fats from American products.    New York City enacted a restaurant ban on the fats in  and several counties in the state did the same. Hospital admissions for heart attacks and strokes in those areas declined  percent starting three years after the bans compared with counties without bans. The results translate to  fewer heart attacks and strokes per  people said lead author Dr. Eric Brandt a Yale University cardiology fellow.    His study was published Wednesday in JAMA Cardiology.    Trans fats also called partially hydrogenated oils enhance food texture and structure. They were once commonly used to make restaurant fried chicken French fries doughnuts and other foods and found in grocery items including cookies crackers and margarine.    These fats can boost blood levels of unhealthy cholesterol increasing risks for heart problems. The FDA in  required them to be listed on food labels and the food industry has been switching to healthier oils.    The researchers examined hospital admissions data from  to  in  New York counties that adopted bans and in  counties that did not. Admissions for heart attacks and strokes declined in all counties going from more than  to less than  per  people but the drop was steeper in counties that enacted bans.    Alice Lichtenstein a heart and nutrition specialist at Tufts Universitys Boston campus said the results are encouraging but that other changes could have contributed such as smoking bans and mandatory calories on menus.    Dr. Mark Creager former American Heart Association president said the results echo previous studies and are consistent with the thinking of most scientists on potential benefits of these bans.    Policies such as these when adapted on a nationwide level will be good for our entire population said Creager director of DartmouthHitchcock Medical Centers heart center in Lebanon New Hampshire."