I lost a stone once doing no exercise - I exercise now, but not sure how much it has contributed as I did it before doing the 5:2. There was an interesting article on this a few years ago - as has been said in previous posts, people who exercise often eat more than they should so it counteracts any advantage
http://www.guardian.co.uk/lifeandstyle/ ... lic-health
http://www.guardian.co.uk/lifeandstyle/ ... lic-health