If your parents or other family members had heart disease, you will get it, too. If you share one or more of the major risk factors, then you are more likely to suffer from heart disease. You will not have a heart attack if you don't have any risk factors. If you are obese, you are a high risk of dying prematurely form a heart attack. If you are obese or simply fat, your greatest danger is from lack of exercise and an increased likelihood of developing hypertension.
Stress has no effect on the development of heart disease.
Stress has a profound effect on the heart and may result in a heart attack and even sudden death. There is no evidence that a low cholesterol diet will reduce the risk of heart disease. Irregular heart beats are dangerous. The sensation of an irregular or premature heart beat, though disturbing, is harmless and not uncommon. It is those that you do not feel that are more likely to be a sign of poor cardiac function.