That Blasted Head Hunger!

So I've been doing great on my high protein/liquid pre-op diet and have lost 11 pounds in 3 weeks from it. As I sit here at my computer with a full belly and not the slightest bit of hunger on my mind and then it hits me. In through my window wafts the awesome smell of someone grilling carne asada and I INSTANTLY feel like I'm starving! I know its only head hunger and that its purely a mind thing so I close the window and distract myself for a few minutes and the hunger is completely gone...go figure...lol