Gwyneth Paltrow chews every mouthful of food "13 times".
The 39-year-old actress - who has her own cook book called 'My Father's Daughter...' - has stuck to a strict diet in recent years, with treats allowed, and reportedly masticates in a set way so as to maintain her slender physique.
A source told the Daily Star: "Gwyn could pass for a 20-year-old. Her figure is amazing, you'd never know she'd given birth to two children.
"She sticks to a very strict diet which involves eating mainly grains and vegetables. She makes sure she chews every mouthful 13 times, at least. She also does organic juice detoxes. It sounds boring but she looks incredible. She works out five days a week and does Pilates."
However Gwyneth - who is married to Coldplay singer Chris Martin - has previously hinted she needs extra help to make sure she looks good, but tries not to diet too much because she wants to "enjoy" her life.
She said: "For me, sleep is a major thing. I don't always get it, and when I don't, I look like I've been hit by a truck.
"I had to work hard to get like this, but now I'm here it's so great because I don't have to think about it. I can just enjoy life. What a relief that is."