How is it that a product that can make people gain weight is allowed to be labeled as "diet"? Doesn't that word imply that it aids in shedding pounds and is something that those hoping to lose or maintain weight should gravitate towards? Coca-Cola Co. and PepsiCo Inc.'s advertising and overall branding of some sodas as "diet" is misleading, so much so that the advocacy group U.S. Right to Know is asking the Federal Trade Commission and the Food and Drug Administration to investigate the companies for false advertising.