Thomas Colin Campbell (born March 14, 1934) is an American biochemist who specializes in the effect of nutrition on long-term health. He is the Jacob Gould Schurman Professor Emeritus of Nutritional Biochemistry at Cornell University. Campbell has become known for his advocacy of a low-fat, whole foods, plant-based diet. He coined the term "Plant-based diet" to help present his research on diet at the National Institutes of Health in 1980. He is the author of over 300 research papers, and four books The China Study (2005), which was co-authored with his son, Thomas M. Campbell II, and became one of America's best-selling books about nutrition, Whole (2013), The Low-Carb Fraud (2014) and The Future of Nutrition (2020).