Dr. James Marcum is a board-certified cardiologist practicing in Chattanooga, and has been named by USA Today as one of the most influential physicians in his field.  Dr. Marcum is the author of The Ultimate Prescription and Medicines That Kill, as well as an in-demand speaker for his role as the director of Heartwise Ministries. In this conversation, he looks studies how the Biblical Prescription of Gratitude can change your physiology.

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