> That form of automation doesn't exist for many types of data people would like to collect, such as food intake, or blood sugar testing for diabetics.

When I was looking into it, I noticed that a lot of the blood sugar testers were electronic and could record the series of readings for you. You still had to prick yourself, but it looked pretty easy.

(Sadly, the one non-invasive blood sugar recording device I found was apparently discontinued for causing electrical burns.)