TV host Sophie Monk has revealed she has been keeping secret a bizarre office lunchtime ritual.

When it comes to preparing one of her favourite meals - tuna and salad- the 43-year-old blonde beauty uses the bathroom as a kitchenette as a way to trap the odour of the notoriously smelly dish.

Sophie opened up about her weird habit during an appearance on Channel Nine's The Hundred with Andy Lee this week.

The panel, including Sophie, were responding to a statistic that said that half of Australia's population thought that tuna in the work place was a no-no.

Sophie said she made up her lunch in the loo because she was afraid of being judged.