Thanks to ARCH blog for highlighting this important issue of ethics brought up in a report by the Institute of Food Research (IFR).
Researchers tracked what children were eating by analysing data from "smartcards", used to buy meals. This method meant the information was "99% accurate" but created "ethical problems" over pupils' privacy.
An Institute of Food Research senior nutritionist said:
"...what a school does with that important health information presents society with an ethical issue".