Ryvita has launched the Party Fit Challenge to help you fit into that Little Black Dress in time for the Festive Season. The two-week calorie-controlled plan, which has already had great test results, is specifically designed for the winter months.

The Ryvita Party Fit Challenge website, which is fronted by This Morning host Fern Britton, has a body mass index calculator to work out whether the Challenge is right for you. There is also practical advice to keep you motivated as well as day-by-day topping and recipe suggestions that can be downloaded in a Challenge kit.

All you have to do is go to google and type in ryvita party fit and then have a look at the site.

There are also plently of fashion tips and a competition to win £250 shopping spree at Debenhams.

Good luck!