Welcome! I myself have only just joined but your post rang true with me, while I am no longer a uni student - I was not that long ago (well thats what I tell myself!!) and definately know where you are at. I was in the same position when I was studying, and with uni in the middle of town making good food choices (especially on a budget!!) was always tough!! Plus being a big drinker, the alcohol plus the hangover food did nothing good for me at all either!!
Good luck with everything, I am starting a fresh monday morning myself and like you am very much looking forward to my new lifestyle!!