You should be very careful on carb restriction. It can cause acid levels to build up in your blood which can be exceedingly dangerous. One side effect: the acids can crystalize in your bloodstream and collect at your joints. In short, you get gout/pseudogout/other gout-like conditions (depending on the exact composition of the crystals).
I know someone who did this; she was bedridden for a month and couldn't turn her head for 2 months.