For the record, I'm curious because I'm following wavelength's diet guide (
http://forum.bodybuilding.com/showpost.php?p=312607141&postcount=1305) and it's worked well for me so far.
I've never dieted down before, and these days training at all is a challenge for me (I think my body is seriously fucked up somehow) yet I'm still happy with the results thus far (down about 14 lbs in the first month -- actually I'm worried about muscle loss but I think that's more related to my inability to train properly).
Although I dunno how relevant this is to the discussion at hand, because my average meal isn't kit kats but .5 lb chicken, 2 cups rice, a tablespoon of olive oil, salsa and water. Still, both kit kats and chicken/rice mush can conform to the wavelength principles.
I have loosened up a lot with regards to liquid calories and protein powders, plus cheat meals on the weekends. Sometimes I eat relatively healthy pizzas, and stuff like that, as long as the macros are right.