The Relationship Between Fast Food Prices and Health Others, BlogNovember 22, 2015Barry Popkin talks to QSR in an exclusive interview about his research that found a correlation between fast food prices and customer health. Is Diet Soda Harmful to Your Health? Blog, OthersDecember 15, 2016Annual soda sales total $61 billion in the U.S. However, the sale of diet sodas has fallen flat recently as more people opt for water or healthier beverages to help them drop weight.