I am a young athlete (runner) and struggle with a low heart rate. I have struggled with an eating disorder in the past but have since recovered and am at a healthy weight. However, my heart rate dips below 40 bpm at night when I’m asleep. I am told that it is because I am not eating enough and my doctors will not let me exercise. My EKG however looked fine. I feel fine and experience no symptoms (fainting, lightheadedness, low energy) and am even able to run long distances without any problems. I have heard that low heart rates are very common in young athletes and especially runners. That being said, should I believe at this point that it’s still due to under-eating? My BMI is 24…how could I be under-eating?