No need to do calories deficit, I do low carb or keto eating lifestyle, didn't count calories at all and I didn't exercise for a year, from 56kg drop to 47kg. No exercise can lose weight one but not healthy, sometimes susceptible to cold, flu and fever.

umm... you misread? I am not on calories deficit, I eat 1000 to 2000 calories a day. If you mean deficit in carb's gram then yes. My carb were below 20g a day.