When your weight loss is the result of starvation, or some other unsustainable sort of diet regimen, one runs the risk of a Boomerang Affect, where all the weight lost comes back, plus a little bit more. I know this from experience.
Once still needs to eat sensibly, practice good breathing and move around some, but it’s often best to accept the natural weight your body seems to ‘want to’ settle at.
Eating sensibly must also include carbs if the weight boomerangs back.