I strongly suggest you purchase and download "Rapid Fat Loss" by Lyle McDonald. There is no other more effective way that I've found. It's a rough diet to follow but it really works very fast.

I lost about 20 pounds in 6 weeks recently. Nothing too complicated to my methodology. I did weigh/measure everything and count calories to stay at a fairly low level. All paleo. I cut things like nuts and fruit. IF with two meals per day - Noon and 7PM. Lots of long walks, in the range of 4 to 8 miles per day. Three heavy kettlebell workouts per week. One long run per week (long for me, about 3 or 4 miles). And that was it. 20 pounds gone and it's still gone. Most of the weight was lost in the last 4 weeks.

Sounds as though you have a really interesting challenge with a career on the line.

Don't fail before you start by having unrealistic expectations. But one thing I do know is that a strict low-carb diet or even Tim Ferris' slow-carb really does work very well. The point is that you have to rigorously stick to it. I say jump in and give it a go, along with some simple regular body-weight exercises and I think you will do well. You could try something like the PAGG stack but I can't say for sure if it was that effective for me over and above going low-carb.

http://www.marksdailyapple.com/how-to-succeed-with-the-primal-blueprint/#carb-curve

Smart-ass answer: amputation.

Real answer: You might want to be a front-line guinea pig for Quilty's new cold thermogenesis protocol. Sitting in an ice cold bath apparently burns many more calories than running a marathon. The guy who did the TEDMED presentation in the citations section lost 4.8 lbs. per week (30 lbs. in 6 weeks) with cold water exposure.

http://jackkruse.com/the-evolution-of-the-leptin-rx/

Get freezin'!...gradually, mind you.

Fasting is fastest. Just drink water for the next 6 weeks and I guarantee you'll easily have lost 7-10kg. Possibly 3 times that if you have plenty to lose. Of course any diet is only as good as its compliance. However there's something to be said for keeping it simple. And if approached correctly it's not necessarily unhealthy. There's plenty of people to swear by all the other diets being advocated, and you need to decide what you can stick to, but simply to present an alternative without necessarily recommending it here goes:

I'd spend the first week cleaning up the diet, ditching the addictive foods so you can get the withdrawal out the way so lose the coffee and grains and wind back all carbs while eating really big steaks with eggs and bacon. This'll be when you can adjust your water needs as well as you'll stop retaining as much. As others have said, that's probably half your problem right there. Then stop eating. A week may be enough depending on whether you're heading for 7 or 10kg, but 2 weeks will be better. You want to end up a few of kilos below your target so you can just monitor that if you like. It's not impossible to go for 3 weeks. At the end of the fast, you're going to take at least a week with bone broths, poached eggs and small portions! A few days to get your digestion back up to speed before trying anything too challenging, and even then you're looking to eat meat. If you fasted 2 weeks then you'll probably find that the remaining 3 weeks is plenty to get back up to speed so take your time and avoid getting sick. You'll be gaining weight back as soon as you start eating so don't panic. Don't over-exert yourself during the fast, but feel free to walk as often as you can.

Almost certainly unnecessary and certainly a challenge but it's really that important and you're motivated then it's kinda hard to go wrong on the weight loss. You do need to watch out for other risks though.

Without doubt I'd say Intermitant Fasting without making up for lost calories in subsequent (Paleo) meals...

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