Will I lose weight while drinking cinch shakes?

So I want most of my loose fat around my thighs and low waist area to be gone.. and I have so far 1 tub of the vanilla cinch powder... I mix it only in the mornings for breakfast and I was wondering if I did this until summer would it look like I lost some weight? and if I got off of it and ate normal breakfasts would I gain it all back? And last question.. to lose even more weight could i substitute my lunch with this shake too?? Please and thank you!