Former Boston Red Sox infielder Lou Merloni is helping lead a national effort to raise awareness about heart disease and the importance of knowing your LDL cholesterol, often called “bad cholesterol.” Merloni has partnered with Merck and WomenHeart for Playing with Heart, a multi-season campaign involving nine Major League Baseball teams, including the Red Sox, Yankees, Cardinals, Phillies, Braves, Astros, Padres, Giants, and Angels.