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A recent study has shown that rats who are fed excess amounts of Vitamin K had greater amounts of brain sulfatide concentrations. This study indicates that Vitamin K has more uses that originally thought, thus furthering the importance of daily Vitamin K intake. The same study showed that a diet with insufficient Vitamin K levels decreased the brain sulfatide concentrations in rats at the (p < . 01) significance level.

Sundaram, K.S., J.H. Fan, J.A. Engalke, A.L. Foley, J.W. Suttie, and M. Lev. "Vitamin K Status Influences Brain Sulfatide Metabolism in Young Mice and Rats ." Journal of Nutrition. 126. (1996): 2746-2751.