Runners can be a healthy bunch, but it’s a mistake to think that all that exercise can completely protect you from heart disease. It’s important to understand the risks. It’s still the number one killer of Americans, according to the CDC, but it can be tough to spot before it’s too late. “For a lot of people, the first symptom is sudden death or a heart attack,” says Steven Nissen, MD, chair of cardiovascular medicine at Cleveland Clinic.
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