That is according to her Twittter site, where the 45-year-old suggested that despite being surrounded by friends who were eating chocolate treats, she managed not to give into temptation.
She tweeted: "Woken up to sunshine and lots of my best friends. Watching them eat pain au chocolat. Me drinking hot water. Yes, water."
The bikini designer, who once said in an interview with the Sunday Times that having to reveal her near-naked body for a fashion shoot was "unmitigated hell", is clearly keen to keep in shape.
Hurley said that she had endured a "sweaty workout" and that the exercise had left her feeling as if she wanted to retire to bed.
On her website, elizabethhurleyfood.com, the actress explained that she runs a 400 acre farm in the Gloucestershire countryside which she has converted to "full organic status".