<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi. I am wondering if there is any risk to the heart when on the ChatDoctor diet. I have been taking ChatDoctor drops for 3 days and woke up this morning with a pounding heart. Could this be because of the ChatDoctor diet? If so, is it the drops themselves, or the restricted calories that could be causing my heart to pound? I am healthy, 46, and would like to lose 30 lbs.  <response>: Chat Doctor diet is typically just 500 to 800 calories a day. As you are restricting your calories body may get deprived of regular electrolytes which body is taking, hence BP may fall and cause palpitationtachycardia_as you are taking only 800 calories, I may be possible that long fasting hours during night decreases your blood sugar levels and causes palpitation. Measure your fasting blood sugar next time you feel palpitation. 