Type A: I am a type A personality, which increases my risk for coronary heart disease. My negative emotions and behavior affects my blood flow, but surpassing these emotions heightens the risk even more. Similarly pessimism is toxic, causing a two times increase in likelihood of heart disease. Also depression is the worst of all. Because the negativity with depression is caused by the disease and may be the reason why depression is lethal at all...other than suicidal risks.