Slimming is a comprehensive project. Exercise is beneficial to slimming, but it can be done without extra exercise. As for whether you can lose weight just by giving up sugar and not exercising, it depends.

If your intake of protein is too low while abstaining from sugar, it will lead to the decline of basal metabolic level. In this case, there is no way to lose weight. Even if you lose weight, it is also a kind of diet, which is not good for your health.

However, if the intake of protein is ensured while abstaining from sugar, and the basal metabolic level is improved, it is possible to lose weight and it is not easy to rebound.

I hope I can help you.