Thanks! I'm still a work in progress, but I'm getting there slowly. You know, our starting and goal weights are quite similar. At my heaviest I was probably around 85kg (I didn't weigh myself for years so I have no idea) and eventually I'm hoping to get down to 60kg. 68kg is just what it will take to get me into my healthy BMI range so it's more of an interim goal.
If you're looking to lose weight fast and you don't mind hard work you might want to have a look at Michelle Bridge's book 'Crunch Time'. She's one of the trainers from the Biggest Loser and she's put out a book with eating advice and an exercise plan to lose weight quickly.
There are two schools of thought when it comes to weight loss: slow and steady wins the race, and fast gets the results you want in the time you want. I've followed the former for most of my weight loss journey. Small changes here and there to lose weight over time, but not altering your lifestyle in any dramatic way so that it's easier to keep those changes as permanent. It's been working, but I think it requires a lot of determination because you have to be willing to stick to those small changes in the long haul. You also have to be willing to keep to it even when there's no change on the scales for months on end. It's taken me over three years to lose eight kilograms, so I can certainly attest to the 'slow' part of this method!
Michelle Bridges argues that quick weight loss keeps people more motivated, and so it's more likely to get you to your goal weight. I can certainly see merit in what she's saying, but you have to have the drive to dramatically change your eating habits and the dedication to do intense exercise almost every day for the time that it takes you to lose that weight.
Many people will argue that slow-and-steady will help you keep the weight off permanently, since you'll be used to all of the little changes you've made over time and it will be easier to keep them for the rest of your life. However, I think that maintenance is just as hard as losing the weight in the first place and it's important to realise that regardless of whether you lose the weight quickly or slowly. So if you lose the weight quickly and you're willing to work at your maintenance you should be just as successful in keeping the weight off as those who lose it slowly. The danger really comes when you become complacent and think all the hard work is done so you can go back to your old lifestyle, when it was that lifestyle that caused you to gain weight in the first place!