Sandilands, who has only just returned to the airwaves with Jackie O after their on-air rape revelation scandal, has again sparked controversy, this time with his comments about the popular comedian.

''You put her in a concentration camp and you watch the weight fall off … like she could be skinny,'' he said on the 2DayFM breakfast show.

Szubanski has lost 25 kilograms in a well-documented weight battle as the face of Jenny Craig. Sandilands and Jackie O were debating who should be the next face of the weight-loss company.

''Let's face it, Magda could have another run at it couldn't she, she could get another season out of them,'' Sandilands said. ''She's not skinny.''

When Jackie O said Szubanksi had already said she may not be able to lose any more weight, Sandilands responded: ''That's what all fat people say.''

In a statement yesterday Szubanski, whose father was Polish, described Sandilands's comments as ''abhorrent''.

"I couldn't give two hoots about what Kyle says about me, but to trivialise what happened to people in concentration camps is abhorrent," she said.

The chief executive of the Jewish Board of Deputies, Vic Alhadeff, said the Jewish community would be outraged with Sandilands's comments, ''as there would be outrage amongst all people of good will''.

''Millions of people have been killed in concentration camps in recent history, such as Cambodia and Bosnia - and the Holocaust - and there is no place to make light of an incident of such inhumanity and of such grotesque proportions,'' he said.

Sandilands and Jackie O returned to the air three weeks ago after a two-week ''recess'' imposed by Austereo over a segment in which a 14-year-old girl who was hooked up to a lie detector revealed she had been raped when she was 12.

In a statement last night Sandilands apologised for the slur. ''It was not my intention to upset anyone and I sincerely apologise to anyone offended by my comments.''

Austereo has been contacted for comment.