The wife not on board and "accidentally" leaving junk food around has come up before..here is a good thread with advice how different ways to handle it.

http://forum.lowcarber.org/showthre...57&page=1&pp=15

My new favorite writer on habits is Gretchen Rubin. Her view is that there are four personality tendencies and different approaches will work for different people. On her website under resources you can find a handout "Eating Better than Before" are you an Abstainer or a moderator? Maybe a clean slate opportunity would help you? (You Clean out and rearrange cupboards...all junk food must go in one and only your wife touches it ) Convenience/Inconvenience, Etc. http://www.gretchenrubin.com/wp-con...ng_onesheet.pdf. (Also a .pdf on exercising)

More on her habits book and how she personally eats LowCarb: http://forum.lowcarber.org/showthread.php?t=468195