Book excerpt: Keeping Your Heart Healthy Takes More Than Just Diet and Exercise Heart disease is the number-one killer in America today, and although you can find an abundance of advice on heart health, much of it is incomplete. The truth is, your physical health is inextricably linked with your spiritual, mental, and emotional health and you can't fully heal one area without addressing the others. In Spiritual Secrets to a Healthy Heart, Kara Davis, MD, combines the most current medical research with biblical principles and practical health tools to give you everything you need to keep you--and your heart--healthy.