I had the heart flutters one of my days on RFL, it was because I wasn't taking the my supplements for potassium, calcium, magnesium etc. Once I started taking those again I didn't have any issues.
Last night we were watching Survivor (if you aren't familiar its reality TV where you have to stay on an island with minimal food and compete in challenges to remain in the competition for $1m) and once some of the contestants were kicked off they re-weigh themselves. At around 30 days most of them were in excess of 20lbs lighter. I think 19lbs was one of the lowest I saw and the guy was already pretty skinny. Point being, in absence of calories, you will lose weight.
Now there is nothing wrong with taking a break from dieting but anyone can lose weight, you just need to keep working at it.