I highly recommend it, foolproof.
Take a couple of feet of snow and multiple local road closures and closures of amenities. Ideally this to happen unexpectedly on the day before you normally go grocery shopping so you have virtually nothing in the house. Whatever food you have is what you have, and you have to make it last so if you binge it there's nothing. You will get creative with recipes when you realise the ingredients you have left are rice noodles, wheat flour, cornflour, eggs and vinegar. Oh, and half a pack of soy mince.
If you do decide to break out and walk down to the local store to get some chocolate treats then you will have to keep pulling yourself out of the snow or nordic ski there. Either way you'll probably have burned off whatever you are buying, and most likely turn back after the first 18 yards when you realise what a stupid, stupid idea that was!
So there you have it, the snow diet. Void in areas where snowmobiles are in use.