Why do I stay fuller longer after a protein drink than after solids?

Ok, here's what happened.....for breakfast this morning I had a double protein drink that gave me 40g of protein and I wasn't hungry at all the entire morning....for lunch I had some crackers and braunschweiger (sp?) at noon, and by 2pm I was starving.....WHY???????? I had the protein drink around 8:30am. I'm 11 months post and have lost 115 pounds. Anyone else experience this? This was the first time I've had a double protein drink breakfast...maybe I should do it more often!! Thanks for the help.

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