What do you do on the weekends? Do you hang around at home and not do much? Are you really busy during the week at work/study and feel you need to relax all weekend on the couch? I'm not sure what you do on your weekends but I find if I just hang out at home I get hungry because I'm bored. Have you thought of increasing your activity on the weekends, relaxing type activity though that gives you a break from your working week?
I'm not sure what you like to do but you could also incorporate exercise type activity that could aid your weight loss like join a sports club (like bastketball, football, tennis, swimming or the like), go the beach with friends for the day, cycling, surfing, boating, sailing. Depending on your level of fitness you could even join clubs that do things like rock climbing, abseiling, hiking, some of the more adventurous things. Other options are leaning a musical instrument, going to singing lessons, dancing lessons (depending on what you like), drama class, art class, drawing, painting, sewing, modeling, gaming - all sorts of mental pursuits.
There are other things you could do. Visit family and friends, there are always chores to do around the house, cleaning, mowing the lawn, (ok, now I've just stepped over the line). I think what I am trying to say is that if you keep yourself busy (most of the time with pleasurable things) you won't be thinking of food as much - that's what helps me, anyway. Good luck.