All pilots should take my wifes advice:
Do a ten day detox at the beginning of the month followed by as much fresh veg (raw or lightly steamed) fresh fruit as you need to stave off the pangs; 2-3 litres of pure water (no other drinks, yes, booze, tea, and coffe), mineral and vitamin supplements, for the rest of the month.
Repeat this each month until you reach the weight you want then you can wean yourself slowly back onto the good things - in moderation of course - but continue the supplements and water intake. Or, try the Hay diet as a way to continue for the rest of each month instead.
You will end up with stabilised blood sugar and lower cholesterol plus lower blood pressure - that's if you've been keeping up the exercise - and generally feeling about ten years younger.