A study by psychologists at SUNY Buffalo suggests that, if you’re interested in encouraging the consumption of nutrient-dense foods like fruits and vegetables, and decreasing the consumption of what are politely referred to as “calorie dense, nutritient-poor foods,” you’ll get further by slapping a tax on the latter, than by decreasing the cost of the former. Make the lettuce cheaper, and folks will spend their savings on Cheetos! Or so this study showed.
Check it out here