Sometimes you can make a game of it, if that helps any. For example, have your co-workers gamble on the number of carbs in your meal or what your next blood sugar reading will be. Even if they're betting nickels, it could be fun. You'll have a reference for them to rely on, sort of akin to a racing form at the racetrack :)
Another option, if you have a good memory, is do all of the writing at the end of each day. It might take 10 minutes right before bedtime.