The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Bogdan Bogdanov:
Add all the nutrients(38) of the foods and drinks chosen by you to the Health App in just two clicks on your iPhone screen.Add the foods and the drinks to create a meal which you can eat now or later with notification. You can check all the nutrients that you ate today, this week and this month which Health App supports directly in a form of a diary. You can also see in a graph how many nutrients you have consumed for the past seven days, eight weeks and the last nine months. With Meals Diary you can see what meals you ate over a certain period of time.Expect updates with more extras every month!