Thanks for your interest. Drinking 1 sachet per day will provide you with substantial amount of protein which will help you to build more lean muscle and with more lean muscle, it will boost your metabolism so you can burn more calories.
Besides, our protein shakes also contain NO ADDED SUGAR, were its; calories is very low.
Boosting metabolism & cutting down calories will definitely help in slimming down.
For your information, slimming down is a whole process where it involve every part of your body. The best way is to cut down calories (mainly sugar & carbs as it will turn into body fat store) and boost metabolism so you will be able to burn the existing fat store in your body.