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A study of 766 otherwise healthy adolescents showed that those who consumed the least vitamin K1– found in spinach, cabbage, iceberg lettuce and olive oil – were at 3.3 times greater risk for an unhealthy enlargement of the major pumping chamber of their heart, according to the study. Vitamin K1, or phylloquinone, is the predominant form of vitamin K in the U.S. diet.