Just like with any food, it all comes down to calories: If you eat more calories than your body needs, you will gain weight. Eat fewer calories than your body uses and you will lose weight. Therefore, eating a deficit of 500 calories per day and you should lose about 0,5kg a week and vice versa.
SATURO makes counting calories easy for you! You always know that one 500ml bottle is 500 kcal and one 330ml pack is 330 kcal.