Heath shakes another unhealthy fad?

Heath shakes another unhealthy fad?

Meal replacement shakes are a growing diet trend, and while convenient, they're ringing alarm bells with some dieticians.

In the past year, one company in particular, Isagenix, has had a 500 percent growth in New Zealand.

ABC director and dietician Angela Berrill this morning joined Paul Henry to discuss whether meal replacements like health shakes are actually good for you.

Watch the video for the full interview.