12, Sanford, North Carolina
POSITION: Coauthor of Portion Size Me: A Kid-Driven Plan to a Healthier Family
NOTABLE FOR: Fighting back against weight-based bullying. Marshall recruited his family into a month-long healthy-eating pledge two years ago, which he envisioned as the opposite of Morgan Spurlock’s Super Size Me. The project led to genuine lifestyle changes—he ultimately lost 36 pounds—and then a book, written with his mother.