Campbell has become known for his advocacy of a low-fat, whole foods, plant-based diet. He is the author of over 300 research papers and three books, "The China Study" (2005, co-authored with his son, Thomas M. Campbell II), which became one of America's best-selling books about nutrition), "Whole" (2013) and "The Low-Carb Fraud" (2014). Campbell featured in the 2011 American documentary "Forks Over Knives".