[Marty Ward]

I noticed the same thing. I never run short of organics.
You could add a negative organic resoure generation to some buildings to simulate the food used but the modifier would not be constant, it would be affected by all your race/population/happiness bonuses. It does work though.
I have added a -10% organics generation to most of my buildings, costs about 20 organics per building per turn on a 100% planet with my race bonuses. It doesn't seem like much until you colonize 1/4 of a 255 system galaxy. Then it adds up. I've actually not built all the possible buildings on a planet to conserve resources at times. I've built more farms in this game than all my other combined I think.