The mind is a strange thing in the early days. Like nic says flood yrself with fluids one of the most likely causes is thirst. Even 13 months out i have a drink befor i have something to eat just in case its dehydration as opposed to hunger.
The other thing i do is to make sure that whatever i eat is the most tasty, healthy, nutrious food so that i am satisfied both in terms of full but also that my taste buds are happy.
It may take longer to prepare a meal but its worth it in the long run as you go through a whole range of processes from deciding what yr going to have, the effort in making it, the stimulation of the smell, gastric juices and taste buds whilst its cooking and finally the pure satisfaction once you have eaten it.
I ony eat when im hungry and my usual day consists of a milky coffee on waking 6am breakfast once the children have gone to school 9am, lunch is usually around 2pm and dinner once the children are in bed 8pm. i drink skinny latte's during the day so am taking on protien during the day. i also drink watered down fresh orange juice or cordial.
it really is a battle of belly and head in the early days but learn to listen to yr body and you wont go wrong.
hth
carole