DutyPaid saidOk - I'll bite on this one.
You can find all manner of diets promises fast results, one even gets prominently advertised here. However, my sources tell me that anything more than a kilo a week gets you into danger territory, ie. unhealthy & eats into muscle. When it comes to weight loss slow & steady wins the race.
Not what you wanted to hear, sorry.
I have to disagree with the whole 1 kg a week or 1-2 lbs, thats old school thinking. That figure IS realistic for most people, but its also safe to lose more as long as its done correctly.
If you just cut your calories back really hard, then yes, your body will go into stravation mode and eat your muscle, but if you eat sufficient calories and create the calorie deficit from working out instead of cutting your cals really low then you are capable of losing a lot more than 1-2 lbs and doing it safely. This is essentially how they do it on the Biggest Loser tv show. I wouldn't however recommened someone go all out Biggest Loser style (they do about 1 hr resistance and about 3-4 hours of cardio every day, 6 days a week!) as they are all under medical supervision and when your working out that much, you are prone to injuries, etc.
If you want to quickly shed some weight, watch your calories (google BMR caculator and AMR caculator to work out your cals)) and then crank up the cardio (ideally threadmill) and make sure your working out at between 80-85 of your max heart.