Digestion system means a digestion enzyme carried a digestion process the moment the saliva and the food fallen in the stomach.

Then enter the intestine beginning where biles from gallbladder and pancreas secrets their …what do you call that secretion to the same structure GI track, so the continuation of digestion for what reason the intestine are loooooong all at your abdomen area cluster looking to then ascending, transcending and descending colon that squeeze out the poo’s water - becomes like a solid rather than paste form, similar to meat, rice, starchy those…makes you constpation. 

If you drinks the juicing only …there is no solid thing anymore inside that GI track. It’s just liquid being absorb and intestine mostly absorb the nutrition that’s why before colon ?