I've now been doing sole source+ for four weeks. I am pleased I've lost a stone but feel with 5stone left to lose it should be coming off faster. I lost 1.5lbs this week. 2 last week. I'm drinking 2.5 litres of water a day. Im stumped why my weight loss is slow. I'm gutted with 1.5lbs when I could lose that eating properly on slimming world. Any advice?