You need salt. In it's most natural form is best - rock salt or sea salt. Because you are flushing through very quickly to get rid of the waste products from burning fat, to start with you also flush away quite a lot of electrolytes - your body will adjust in a few weeks when it catches up with the speeding up of all the flushing processes, but for now you're flushing them out quicker than you can replace them so you will be a little short. A decent dose of freshly cracked sea salt on your swede chips will sort it out