It is said that 50% of what is taught in medical school is wrong, but no one knows which 50%! For 50 years it has been taught that a low HDL cholesterol is a danger while a high HDL-C is protective.   This week, Dr. Kahn discussed new data that completely changes that simple formula and turns it on its head. Before that, Dr. Kahn discussed how vitamin K plays a role in certain proteins, including Matrix Gla Protein, to prevent calcification of arteries and valves.   A study using high dose Vitamin K2/M7 to prevent valve calcium has been published and it has mixed finding. The heart artery findings are hidden and provocative.