MILAN — Culinary tourists are pushing growth in foreign tourism to the United States, which is transforming its image as a fast-food mecca to a land of regional tastes and dishes, said officials visiting the Expo 2015 world’s fair focusing on food this week. The number of foreign tourists to the United States in 2014 rose by 7 percent to over 75 million, contributing $221 million to the economy, according to Christopher L.