Does apple cinnamon instant oatmeal make you fat?

Ive been gaining weight in the last year so I decided to change it up a bit. I have been pretty much strictly only eating apple cinnamon instant oatmeal (Spartan off brand kind) because I found out it is delicious and super cheap. $2.50 for 10 packets. I have been eating about 4 packs a day. That turns out to be about $7.50 a week on food!!! I also throw apples in there usually once or twice a day. My question is will just eating this make me gain weight? I know oatmeal is good for you apple the apple cinnamon instant thing kinda makes me wonder if it is fattening. Thanks!