how is it im still passing "stool" even tho i havnt eatten anything other then one shake ?

Since when? You can still have food in your system for even a full week. And then your body I'll continue to produce digestive juices and bile and I'll still have to digest the protein shakes - the role of your colon is to reabsorb water (digestion takes place in the smll intestine mainly) so e the waste from a liquid diet can still be semi solid. But it might be reduced from your usual volume and maybe not every day. Or you might have a bit of diarrhoea.

thanks,, that was really helpful