The things we should fear are myocardial infarction [1] and cerebrovascular accident [2]. These are what will probably kill us in developed countries [3]. The good news is that we know how to prevent many of these deaths: regular exercise, not over-eating, not smoking and moderation in alcohol and drug consumption. Other causes of death and ill-health are also reduced by these actions.
An excellent response to nearly any concern of disaster, terrorism, or other highly-visible but highly-unlikely danger. Fear is only natural, but it's amazing how quickly it can be allayed with a little perspective.