Awhile ago I started having heart palpitations. I went to my doctor, but they seemed to come and go (week on, week off). I believe they were PVCs, but nothing came up on the day I went to my doctor and the ECG came back normal. He told me they were probably harmless, but suggested a Holter Monitor if they were bothering me that much. I declined and went home. I thought about when they started and noticed it was a bit after I went vegetarian that they began to occur. Preliminary thinking was that it might be a B12 issue, but B12 deficiency takes a long time to develop and, as far as I knew, I was getting enough B12 in my diet, so I started to look for other answers. When I went vegetarian I started drinking soy milk in the morning and wanted to test that hypothesis so I have since cut soy from my diet. My heart palpitations have since stopped. I'm not sure it is a causal link yet, but I'm wondering if anyone has experienced anything similar.