Top 10 DMAs in which reside adults who drank diet soda in the past week: 1 Des Moines/ Ames, Iowa 2 Green Bay/ Appleton, Wis. 3 Lexington, Ky. 4 Birmingham, Ala. 5 Charleston/Huntington, W.Va. 6 St. Louis 7 Cincinnati, Ohio 8 Indianapolis, Ind. 9 Greensboro/ High Point/ Winston Salem, N.C. 10 Grand Rapids/ Kalamazoo/ Battle Creek, Mich. Source: Scarborough Research, www.weknowthelocals.com