This study examined the relationship between dietary vitamin K intake and markers of left ventricular structure and function in 766 adolescents aged 14-18 years. The study found: 1) Higher vitamin K intake was associated with beneficial alterations in left ventricular structure, including thinner walls, lower mass, and decreased relative wall thickness. 2) Higher vitamin K intake was also associated with improved left ventricular function as shown by increased midwall fractional shortening. 3) There was no association between vitamin K intake and left ventricular internal dimension or ejection fraction.