In April 2015, the US Right to Know (US RTK), a non-profit organization that reports on food industry issues on behalf of consumers, sent a letter to the Federal Trade Commission (FTC) and a citizen petition to the Food and Drug Administration (FDA) with requests to investigate diet soda manufacturers for misbranding and deceptive advertising on the grounds that the “diet” products contain artificial sweeteners that US RTK alleges actually contribute to weight gain.