Many people are genetically predisposed to developing certain diseases, among them diabetes, cancer, heart disease and Alzheimer’s. It’s natural to worry if you’ve watched family members endure the illnesses. However, the cortisol released in your body by chronic stress, which can be caused by worry, could increase your susceptibility. The fix? Be proactive. Limiting stress may not completely protect you from the disease that you dread, but it can help your overall health and, for some diseases, this could help you avoid a trigger. Where do you start?