Mayor Rob Ford has cancelled his once-weekly City Hall weigh-in for the third time in five weeks.

Ford also missed his weekly radio show on Sunday. His brother, Councillor Doug Ford, said on the show that the mayor was “under the weather,” though “not too bad.”

No explanation was provided Monday for the cancellation of the weigh-in.

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Ford also cancelled his weigh-in without explanation two weeks ago. Two weeks before that, he cancelled because of a “very busy day.”

“Details of a rescheduled weigh-in will be provided in a forthcoming media advisory,” his office said in a news release Monday. The office said the same thing upon the cancellation two weeks ago, but the weigh-in was never rescheduled.

Ford has lost 18 pounds during his “Cut the Waist Challenge,” which he launched in January, but he has struggled in recent weeks. He weighed 312 pounds last week, up from a low of 308 pounds in February; his goal is to weigh 280 pounds by mid-June.