Hehe, that's the one I just posted under "no longer obese!!!!!" - fab, isn't it? Most of your queries about it will be answered if you go to the original post (put up by the guy who invented it) - it's a sticky in Cambridge Diet Forum.
To anyone who can't open this, I would suggest you PM the guy who wrote it - he's a real sweetie and won't mind at all. (People are not saying whether they can't open the zip file or the actual spreadsheet, so it's a bit hard to help out, just off the cuff.)
It's great isn't it? I downloaded it tonight onto my laptop. Kept wondering why it wouldn't open on the desktop then realised I had deleted Excel from there but had forgotten to get rid of the shortcut!:d'oh: