The mayors of New York, Los Angeles, Chicago and 15 other cities are reviving a push against letting food stamps be used to buy soda and other sugary drinks. In a letter sent to congressional leaders on Tuesday, the mayors say it’s “time to test and evaluate approaches limiting” the use of the subsidies for sugar-laden beverages, in the interest of fighting obesity and related diseases. “We need to find ways to strengthen the program and promote good nutrition while limiting the use of these resources for items with no nutritional value, like sugary drinks, that are actually harming the...