I was searching on google for something cycle-related I think and came across this great site:-
This chap has lost a massive amount of weight (7st plus!) using a similiar plan to my own - healthy diet and lots of exercise. His outlook on life is bop on in my opinion and the site is inspirational - certainly made me ride a bit quicker last night when I was out on my 10pm ride!!
Check it out - well worth a look.