Hmmm I'm not wholly convinced this would be any better for insulin users than taking their log books with them. Firstly it assumes there will be staff available to read these passports, then arrange for a totally different diet to what every other patient is given and if that doesn't happen then the patients insulin regime will have to change to accommodate the new diet eaten in hospital.
Perhaps I'm just being my usual cynical self but are these adjustments really going to be made on todays busy wards at a time when cutbacks are being talked about on a daily basis?