4 days in and lost weight?

Is this normal? And is it simply water weight? I’m doing 16:8 and low carb with light cardio (walking briskly 30 minutes everyday). I don’t have a scale yet (it’s on the way!) but I swear I look and feel just sliiiiightly more trim. via /r/intermittentfasting https://ift.tt/egSrx2n https://ift.tt/msCZcq0