Assume the smoothies have the same nutrient profile as a regular diet. Like if you drank runny mashed potatoes and protein powder to simulate a normal food intake.
If you do poop because of the nutrients, is there a healthy diet at which waste products are no longer left in the intestine to turn into poop?
Drag has no intention of doing this, drag is just curious about the science.
Well, physical scrubbing, sure. But also, specific fibers are required for a healthy gut microbiome to function and maintain a proper balance of microbes that produce other micronutrients that your body cannot make on its own as well as fending off the types of microbes that subsist of sugars and fats alone.