Need refresher

I too have been gaining weight since my surgery in 2008 after I lost 100 pounds.  I am snacking way too much and with the wrong foods.  I still can only eat about 1/2 c. of food at a meal but it is the grazing that is killing me.  I need a refresher course on some good nutritious low calorie and low carb snacks.  Any suggestions and/or new ideas would be appreciated!

Terry