Price influences purchases of sodas and pizza

If you are wondering why the idea of soda taxes causes so much controversy, try this: research published in the Archives of Internal Medicine estimates that a $1.00 price increase on soda and pizza would reduce daily calorie consumption by nearly 200 per day and would help people lose weight.

Or, as USA Today puts it, an 18% increase in the price of soda would be associated with a weight loss of 5 pounds per year.