As America gets fatter, policymakers are seeking creative approaches to legislating health. They may have entered the school cafeteria -- and now they're eyeing your neighborhood. Amid worries of an obesity epidemic and its related illnesses, including high blood pressure, diabetes and heart disease, Los Angeles officials, among others around the country, are proposing to limit new fast-food restaurants -- a tactic that could be called health zoning. The City Council will be asked this fall to consider an up to two-year moratorium on new fast-food restaurants in South L.A., a part of the city where fast food is at...