Effective Advertising, but for the Wrong Thing

Our building puts up a mini-poster in the elevator every few days.  You know, what movie is playing this week in the common room on Thursday, guest policy on 4th of July, new "photo of the day" when there isn't any news.
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But since this week-end the poster has been advertising for a nutrition class given by our gym.  My guess is that this picture is an example of "Not Good For You" food.  But it has not had the intended effect.
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In fact, it has convinced Ed to try a MxDonalds Big mac, because it looks so good and he has never had one.  So Sunday we went to the Big Fresh McDonalds and had a Big Mac Meal.
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They taste nothing like this picture.