In reply to lost1977:
I found IF to be a great method of losing mass and body fat % (according to my horribly inaccurate scales!), but plateaued after about 4 months and have kept the 'diet' going since then and maintained a decent weight.
I do 5:2 and dabbled with daily feeding windows (2-bedtime) but found that when the window opened I hit the butties like crazy and was sluggish in the afternoons, particularly for the ride home.
I do notice that my quickest commutes (7miles each way) are at home time (6pm) on a fast day.
Best thing i've found about IF is that i don;t have to worry about how much beer I drink at weekends, i never get a tubby belly!
I think i'll keep it up, to varying degrees of strictness, just because it's really not that difficult; I'd rather have a really hard time with hunger a couple of days a week than have a tough time every day of the week, which I imagine most other diets give you. IF is essentially quite sustainable, long term.