Actually, whatever suggestions you will get, you must have heard them umpteen times. There is nothing special nor are there miracle advices that works overnight. It is really up to you to take them seriously and be willing to change.
1) healthy breakfast, no fried bee hoon or oily stuffs please, preferably fruits and juice
2) recommend fish slice soup with 1/3 bowl of rice. Or else, eat yong tau foo with unfried stuffs and lots of veggie. If possible, skip the noodle or rice.
3) no dinner after 8pm. If possible, limit your rice intake to, maybe 1/3 bowl. Drink a big bowl of soup to fill you up, if you feel as if you did not take your dinner
4) Do some toning exercises before sleep. Do arm stretches, carry 1kg dumb bells and do abdomen stretches.
5) don't sit on the office chair all day long. Try using the stairs and try walking around as much as possible
6) try walking as much as possible. Don't rely too much on the car