And while some might find Roxanne Pallett's claim a little far-fetched, it can't be denied that whatever she's doing is working to enviable effect.
The 29-year-old showed off her gorgeous bikini curves as she hung out by the pool in Tenerife on Tuesday.
Must be doing something right! Roxanne Pallett showed off her bikini body in Tenerife on Tuesday
She wore her long hair up in a high ponytail-a practical option for swimming.
The actress wore minimal make-up, and appeared to have applied just a little waterproof mascara.
Toned curves: Roxanne showed off her new physique to its full advantage in a bright blue bikini
Roxanne took a break from the water briefly, sitting on the side of the pool and dipping her toe in the water.
She read a few pages of Jason Manford's autobiography Brung Up Proper while soaking up the sun.
Roxanne- who is due to star in forthcoming British supernatural film Devil's Tower- recently revealed that the unexpected key to her slim figure is raw mushrooms.
Soaking up the sun: Roxanne took a break from the water briefly, sitting on the side of the pool and dipping her toe in the water
‘This new role that I’ll soon be filming for is important to me and I need to look my best – mushrooms prevent me from gorging on fatty foods,' she said.
'I’ve upped the good foods in my diet. Mushrooms are one of them and they’re healthy - which is an added bonus.
Her secret: Roxanne explained her unusual mushroom diet trick at the launch party of the Bali Health lounge in Manchester
‘I especially love James Martin’s mushroom soup – it’s divine, low in calories and very easy to make.’
Roxanne claimed that raw mushrooms have helped her dropped a dress size in just under two weeks and said she’s incorporating the vegetable in to her daily diet as a way of keeping her figure ‘ship-shape’.