lets put this in perspective, if you go low carb for an extended period and lose a lot of weight, once you increase your carb intake, unless with that u go back to pooe eating habits, you are not going to gain all that weight back. People think induction phase of low carb diets is the only phase, do it for a few weeks lose 10lbs and then go back to eating ras gullay and biryani and gain all back. Thats a whole diff situation.
in a carb restricted diet, you are off of pretty much any carbs initially, and then gradually increase carbs, and in the maintenance mode you eat quite a bit of good carbs without it resulting in weight gain.
There is no logical reason that if you lose a good amount of weight on a carb restricted diet and then incorporate carbs again that all the lost weight will come back, unless as I stated that the weight loss was mostly that initial weight loss of the first few weeks.