I notice when I try to improve my eating habits.. I can get incredibly hungry. Snacking when you are at home all day is a really tough habit to break. One simple solution I have come up with is when my first snack attack of the day hits I take out an entire bunch of celery and fill the sink with water. I separate the celery and put it in the water and leave it. When ever a snack attack hits I grab a stalk or two or three. This really helps curb those hunger pains. If I can remember I also try to drink a glass of water with the celery. Since I am a salt lover I always have some of my favorite flavored salt to add to the celery.
Also I try to put tons of lettuce on my sandwiches and in my tortillas. This is also filling. Yes I still miss M&Ms, candy bars and potato chips... but this helps me to feel not quite so deprived.