Need some ideal while studying

I find the exact same thing..

What I have been doing is
A) not buying the junk food - if it's not there, I can't eat it
Eating good healthy good regularly in meals and making sure I have breakfast
C) Allowing myself to snack on healthy things, like carrots. If I eat 1kg (exaggeration) or carrots in a study session, it's much better than eating 1kg of lollies or chips!

Have also had a go having smoothies/up and go/protein drinks and such to fill you up so you don't have the room to snack.
annnd I occasionally chew gum, meaning I can't put anything else in my mouth.

Hope some of these help, A and B are super important, the rest just falls into place after that.

Good luck with studying!