I've kept a diary from day 1 of being diagnosed. I then progressed to devising a spreadsheet on the pc as the diary was a bit limited and have now gone onto an app as well. I'm probably a bit of a saddo, but I like to see what my bg levels are doing in relation to food. The diary is mainly for the DSN or Consultants benefit, although the HBA1c result probably tells them all they want to know, the spreadsheet is for my benefit as it's a food diary as well and the app is useful as it produces a lot of statistics. As a newby, I'm probably a little bit obsessive at the moment, but hopefully, given time, I'll be more relaxed about the whole thing and learn exactly what I can and can't eat and what my bg levels are likely to be after a certain food.