A new study that followed participants for 20 years shows both weight and risk for diabetes decreased for people in communities where fast food prices increased.

Scientists at the University of North Carolina at Chapel Hill conducted a study using data from more than 5,000 participants who were followed for 20 years.  When prices of fast foods and sodas went up 10 percent, participants consumed an average of 7.1 percent fewer calories from soda and 11.5 percent fewer calories from pizza, translating to about 56 fewer calories a day.  This could lead to about three to four pounds lost each year.

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http://professional.diabetes.org/News_Display.aspx?TYP=9&CID=77158