“We have all the junk in the world up there,” a Bloomberg employee, who declined to be named for fear of upsetting the company, said during an interview outside the offices at 731 Lexington Avenue. “I mean, you can gain 15 pounds in a hurry.”

It is hardly the first time that Mr. Bloomberg’s policies as New York City’s health mayor have come into conflict with his personal eating habits, or, in this case, nutritional options at a place he is closely associated with.

He is known for negotiating voluntary reductions in salt by food companies, and putting salt on his own saltine crackers; for fighting rising obesity among his constituents, and for serving comfort food like grilled hot dogs and ice cream sundaes at his town house.