According to Investors.com, “Putting 18% tax on pizza and soda would likely spur U.S. adults to reduce their calorie intake enough to lower their average weight by 5 pounds a year, a study by the Univ. of N.C. found. Calif. and Philadelphia have introduced legislation to tax soft drinks to try to limit consumption. The researchers estimate that an 18% tax on these foods could cut daily intake by 56 calories a person. Two-thirds of Americans are either overweight or obese, and policymakers are looking at taxing those foods to address the issue.”