what is the biggest risk factor for heart attack?
['Age. Men age 45 or older and women age 55 or older are more likely to have a heart attack than are younger men and women.', 'Tobacco. ... ', 'High blood pressure. ... ', 'High blood cholesterol or triglyceride levels. ... ', 'Obesity. ... ', 'Diabetes. ... ', 'Metabolic syndrome. ... ', 'Family history of heart attacks.']