In april last my weight was 78 kg. After long hard workout, Cardio and healthy diet I reduce my weight till 10 kg. Now I am 68 kg. My problem is that if I fellow workout and healthy diet then ok. But As soon as any day eat some unhealthy food . So my weight from one to two kilos suddenly rises. If this continues, then 3 to 4 days to 2 to 3 kg rises. So my question is why weight rise suddenly and reduce slowly by hard workout and diet. I have no thyroid problem. Please tell me. Why this happened.