DietScan

DietScan is a food diary and meal planner aimed at people who need to keep track of their food intake due of allergies or other reasons.

DietScan's main feature is keeping track or your daily intake by scanning custom QR codes or NFC tags contained in stickers or key fobs.

For sample QR codes and printing templates see http://nealmarriott.com/dietscan

Other ways to add items include a database on the device or manually.
Recipes can be exported and shared QR codes of recipes can be created for sharing via serviced such as Twitter.
Such QR codes can be decoded within the App.

DietScan supports Dropbox syncing for backups or use on multiple devices including both Android and BlackBerry 10.