Si King and Dave Myers create low-calorie versions of their favourite party treats, including fairy cakes, quiche and chilli tacos, and Olly Smith offers advice on wines suitable for slimmers. The duo then reflect on how trying to lose weight has improved their lives and learn whether the Big Dieters have also managed to change their eating habits - before paying a final visit to diabetes expert Roy Taylor and dietician Ashley Adamson to discover if their new diets have yielded the desired results. Last in the series.