When you blend food and drink it quickly your body does not have the time for the standard physiological reactions from the hormonal and nerve signals telling you that you are full and to stop eating.
A typical morning shake for me could be a banana, 2 table spoons almond butter, 2 scoops of protein, coconut milk, 1/2 cup of oats, 2 handfuls of spinach, and a cup of yogurt. That is easy to chug, however if you were to eat that all in a traditional manner you (at least I) would start becoming full much sooner. But over the long term it will satiate me longer.