As ND stated below, Glucofacts stores the data in a SQLite database. All you have to do then is get a SQLite Manager and then read the database, more specifically, read the ResultData table in that database. And, then, you can do whatever you want with data. Since I did not have a SQLite Manger, I performed a search and found a free SQLite plugin for Firefox at https://addons.mozilla.org/en-US/firefox/addon/5817/. The plugin for Firefox has an option to export the resultant output to a csv file.
Paul