Macpherson has attracted a lot of interest with her killer figure and Duigan was contacted to find out the reason for her great shape.

The trainer first revealed that Macpherson is a person who swears by fish oil, and it is one of the reasons she is so trim.

"They're great for helping your body burn fat, especially around your stomach and waist," the Mirror quoted him as saying.

In fact, the latest study, from the Mayo clinic in Minnesota in the US, reveals that the omega-3 fatty acid contained in these oils helps suppress appetite and encourages the body to burn fat around the mid-section.