Americans consume, on average, one-third of their calories from restaurants and other establishments, said Margo Wootan, director of nutrition policy for the Center for Science in the Public Interest. Today, people eat out because theyre busy and its affordable. Many consumers go out to pick up lunch instead of brown-bagging it at work. All this can cause health concerns. Studies show a link between obesity, dining out and eating a lot of calories, Wootan said. Generally, if you look at peoples diets, they are less healthful when people eat out than when they eat at home, Wootan said. They eat more calories, more saturated fats, fewer fruits and vegetables, less fiber, less calcium. You may already see calorie information at your favorite restaurant. Some restaurants and supermarkets already have placed the data on their menus ahead of the May deadline. New York City already has menu labeling.