'The use of general terms on food, such as 'healthy for you' or
'superfood', implies a health benefit. However, these terms do not
communicate why the food is healthy or a super food. So, the
regulation requires they are backed up by a relevant and authorized
health claim. This way the consumer knows why this food is healthy.'
This is a lift up of the portion from an article that I found at

http://www.theanalystmagazine.com/july2007/103.htm