What can reduce the level of bad cholesterol?

Lifestyle . Diet, exercise & weight loss are first line strategies. If this is inadequate to reach reasonable LDL levels them medication. Plant based diets are extremely effective. Good luck.
Find and Treat Cause. As a lipidologist my first step is to determine why the LDL cholesterol is elevated. Several inherited and acquired medical conditions will affect LDL levels. Second, if related conditions are identified i would treat those while also starting diet, exercise and lifestyle modifications. For general diet information see: http://www.Mayoclinic.Com/health/cholesterol/cl00002/nsectiongroup=2.