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He was talking about the "cool factor", presumably as measured by the kids.

She

Thanks, I wasn't sure so I asked.

Ambiguous sentence that could easily be taken out of context, as evidenced by the replies below.

Or perhaps she was just making a joke.

A bit long, but quite intensive critique:

http://www.nytimes.com/2007/01/28/magazine/28nutritionism.t....

Also see Ben Goldacre's Bad Science book, UK edition, but that's probably specific to media nutritionists in the UK, whereas the original post is in the US.

Nutritionists are not professionally regulated like Dietitians are. Therefor Nutritionists are often known for giving psuedoscientific advice in order to push some miracle product.