I'm sure you've heard it before, to chew your food well before swallowing, correct? Well, the reason that this is advised is so that more surface area from the food particles is exposed to digestive enzymes and that the nutrients can be better absorbed and assimilated into your cells. This is basic physiology and has also been shown by research.
In addition to this, you might notice that it's a bit difficult to get through a gigantic plate of vegetables and fruits and nuts and seeds, etc. before feeling stuffed. When you put all of these into a NutriBlast, you are liquifying a large quantity of food into a more manageable form. It's easier to drink all of it w/o getting too full vs. eating it in the form of a salad.
Now the NB doesn't ADD anything or make it extra nutritious - it's just a way to break it down into a "predigested" form so that your body can utilize the whole food's potential! It's not what you eat, it's what you absorb :)
Hope that helps!