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MANY ancient cities were protected by massive walls. If an enemy breached just a small section of a wall, the safety of the entire city was at risk. Your body is like a walled city. How you care for your defenses has much to do with how healthy you are.

Consider five elements that can expose you to disease and how you can put up the best possible defenses.

1 WATER
THE THREAT: Harmful organisms can “march” straight into your body by way of contaminated water.