"Researchers said a [20%] fat tax could drop obesity rates by 3.5%." Is that all? 3.5%? If so, a fat tax alone is not the answer.

http://www.theindychannel.com/health/31079697/detail.html

Report: 'Fat Tax' Could Curb Nation's Obesity Problem

20 Percent Tax Would Be Placed On Unhealthy Foods

"Researchers said a fat tax could drop obesity rates by 3.5 percent and prevent 2,700 heart-related deaths a year."