Whole Foods Market CEO John Mackey’s book tour is off to a sluggish start.

The inaugural event for Mackey’s new book, “The Whole Foods Diet,” held Wednesday evening at the chain’s new Manhattan store at Bryant Park, was sparsely attended, a source told On the Money.

Our source said they “felt kind of bad that it was just him and his half-dozen staffers and no customers. People just did not care.”

Reps for Whole Foods declined comment.