Too much alcohol causes damage to your heart, even if you are young and fit, say the authors of a new study that adds yet another reason to keep drinking to a minimum. Arrhythmia, or an irregular heartbeat, is a problem with the rate or rhythm of your heartbeat and can occur when people drink too much, the researchers in Germany. Scientists studied 200 young men and women who go out regularly and drink two or three alcoholic drinks. All had peak blood alcohol levels of up to 2.5 per mille during the study, a level that means you feel numb, confused, disoriented and possibly sick, medics say. T…