The Centers for Disease Control and Prevention (CDC) produced a GIF image of obesity trends, defined as BMI greater than 30, by state for the years 1985-2008.
By CDC. Animation: Nevit Dilmen (http://www.cdc.gov/obesity/data/trends.html) [Public domain], via Wikimedia Commons
This Rate of Obesity Among Adults map on Community Commons allows you to zoom in to look at the specific obesity rate of your county. Combining these graphics in a report, presentation, or grant application creates a strong visual case for change in your community.