Hihi, try eating brown rice.. my whole family lost weight after
eating brown rice.. haha.. then after that when we switch back 2
white rice again, my mum complained of weight increase 
Another way i tried (n suceeded) was 2 get very involved in your
work n assignments until no time 2 eat. My last time of my final
sem in poly (when chionging assignments) made my weight drop from
48kg to 45kg in abt 2 wks time.. n it's still 45kg now after my
final exam which took place more than a month ago..
i think juz cut down on junk food n dun eat until you're 10/10
full, but rather 7/10 full. it really helps! jia you n all the
best!