New York on Tuesday became the first city in the nation to ban artery-clogging trans fats at restaurants, leading the charge to limit consumption of an ingredient linked to heart disease and used in everything from french fries to pizza dough to pancake mix. In a city where eating out is a major form of activity _ either for fun or out of hectic necessity _ many New Yorkers were all for the ban, saying that health concerns were more important than fears of Big Brother supervising their stomachs.