> Since trying to cut junk out completely is really hard, instead I limit my intake of junk food while ensuring I get the nutrients and energy I need.

I actually find it easier to completely abstain from unwanted behaviour, than allowing myself some and keeping a tally.

The author's method would probably still work for me, as it doesn't require keeping a tally. Not so much for eating, since I don't have any problem with willpower in that area. But for choosing activities.