from upi.com: The difference between the healthiest diets and the least healthy diets is $1.50 a day, U.S. researchers found. Lead author Mayuree Rao, a junior research fellow in the Department of Epidemiology at the Harvard School of Public Health, and colleagues conducted a meta-analysis of 27 existing studies from 10 high-income countries that included price data for individual foods and for healthier vs. less healthy diets. The researchers evaluated the differences in prices per serving and per 200 calories for particular types of foods, and prices per day and per 2,000 calories — the U.S. Department of Agriculture’s recommended average daily calorie intake for adults — for an overall diet.