Your social network. It seems that staying connected is good for pretty much everything about you. Mackenzie Investments and The Globe and Mail present Nicholas A. Christakis, MD, PhD, MPH. He's the co-author of CONNECTED: The Surprising Power of Our Social Networks and How They Shape Our Lives.

Dr. Christakis is a Harvard professor with cross-appointments in the Departments of Medicine, Health Care Policy and Sociology. Last year he was named one of Time Magazine's 100 Most Influential People in the World.

Watch how Dr. Christakis explains how social networks drive our ideas, feelings, health, relationships, behaviour, politics – even our weight.

Below is a short excerpt from Dr. Nicholas A. Christakis’ interview. To view the full video of his interview in its entirety, click here.

To watch the full Dr. Nicholas A. Christakis presentation, click here.