Not too difficult to do so within three months..... a healthy,
well-balanced diet (no, Atkins diet is NOT a healthy, well balanced
diet), and regular exercise should do the trick.
Side issue: I once lost six kilos in ONE month. Then again, that
was because it was the fasting month (I'm Muslim) and I was doing
NS in an infantry unit. Still had to do IPPT, SOC and countless
outfields while not eating and drinking anything.
Anyway, aim realistically, and don't fall for those dumb slimming
pill ads by the likes of Michelle Chong, Fann Wong, and more
recently, Michelle Chia (did I get them right?).
Burn all your fat, not your money!