Use the hunger/satiety chart to evaluate at what hunger level to eat, when to stop eating. This really helped me realize that I was not eating enough at meals, which caused me to snack more often. Get full to the point of "pleasurably full." You'll eat fewer snacks!
To find this chart--Go to articles, then nutrition articles. Find the category of pitfalls and plateaus. The title of the article is "Dealing with Hunger and Food Cravings."