:To my thought, it refers to all substantial controversies about aspartame. (By convention, article titles are in the singular.) Substantial controversies are those which have retrospective coverage (sensationalist headlines immediately following an announcement do not qualify; see WP:Recentism). The Markle hoax, Olney's brain cancer scare, and the Ramazzini studies qualify as controversies: they received sustained coverage by mainstream outlets. It is not just "Weight change and hunger", but a good argument could be made that the bulk of the "Safety and health effects" section should be moved to the main Aspartame article. The only things that would remain of the section would be the second paragraph of the "Cancer" subsection (Olney, which could easily be expanded out to its due weight) and "Ramazzini studies".