Here's the trick for your food stock in cupboard, freezer.
It is common for living home keep their junk food. All you have to do is push all junk food to the back and put healthier food like fruits and vegetables at front. It's all about "psychology" thing. You will reach healthier food first rather than chips behind it!
Source
http://tightlightning.com/2013/08/15/trick-yourself-into-eating-healthier/