Discussing a story that claimed the contraceptive pill is less effective in women weighing more than 72 kilograms (about 11 stone 3lbs), Rachel Smalley said such women were: 'heifers' and a 'bunch of lardos.'
The radio presenter thought her microphone was switched off during an ad break when she made the comments.
She's heard saying over the advert. '72kgs? Heifers!' She goes onto discuss how someone who is 5 6 and weighs that much is a 'lardo.'
Smalley has said that she deeply regrets the comments, made this morning, saying: 'They were offensive.'
'I left my microphone on and a conversation meant for off-air, went on-air and the audience only heard one side of that conversation.'
'I'm sorry. It was a genuine mistake.'
Rachel's comments are bound to upset many women in her home country of New Zealand - where the average weight for women is just over 11 stone.