My resting heart rate dropped to under 40 bpm. Every time I went to a doctor, they commented on it (they frequently thought there was something wrong with their instrument and had to check it manually), but nobody was that concerned… Until I started having problems. I was feeling weak and run down all the time, but everything was fine with my bloodwork, and finally my surgeon suggested it may have been related to my low heart rate and referred me to a cardiologist, who diagnosed me with bradycardia.
The cardiologist said that it was probably because my heart was used to having to work hard while I was walking around with 200 extra pounds, and once I lost so much weight and got in better shape, my heart was stronger than it needed to be and slowed down to compensate. I ended up having to get a pacemaker. The cardiologist said that bradycardia due to extreme weight loss is rare, and that even when it happens, it’s not a problem unless it causes symptoms.