Ancel Keys

Ancel Benjamin Keys (January 26, 1904 – November 20, 2004) was an American physiologist and nutritionist whose research revolutionized our understanding of cardiovascular disease and nutrition. Born in Colorado Springs, Keys earned his PhD in biology from UC Berkeley and spent much of his career at the University of Minnesota's Laboratory of Physiological Hygiene. He is best known for the Seven Countries Study (1958-1970), a groundbreaking epidemiological investigation that examined the relationship between diet, cholesterol levels, and heart disease across different populations worldwide. This study provided some of the first compelling evidence linking saturated fat consumption to coronary heart disease, directly influencing dietary guidelines that persist today. Keys developed the Mediterranean diet concept based on his observations of longevity in Mediterranean populations. Despite some later reinterpretation of his data, his work was transformative in establishing nutrition as a key factor in chronic disease prevention. Keys lived to 100 years old, embodying the healthy lifestyle he advocated, and his research remains foundational to modern cardiology and public health nutrition policy.