I often have days like this.  I'll eat plenty and an hour or so later I'm really hungry again.  For example today's menu (so far).  I had a blueberry muffin and a soy chai latte.  Then as a mid morning snack I had a bunch of green grapes and a big chunk of seitan o' greatness (yes I know they don't go together and yes, I love seitan o' greatness just by itself).  After that I had leftover mac and cheese (New Farm version) and a bowl of Vcon hot and sour soup.  All of this was BEFORE 12:30.  A little more than an hour later I am hungry again.  What's worse is that I have no food left to eat  :( I ate it all!  Now as some of you know, lately my job has been very slow, so I am not running around or doing field work and burning off all these calories.  I am basically at my desk sitting and reading.  Why am I so hungry all the time?  Each week I am packing myself more and more food to take to lunch and I usually keep peanut butter crackers or granola bars in my desk as a "rescue" snack.  Sometimes I get hungry so suddenly that I feel like I'm going to starve!