The Iron Man star shared her secret on how she stays so slender.
For three weeks, the star adheres to a strict detoxification after gaining a few pounds.
The 36-year-old actress said that she follows the Clean Detox Programme. The special diet prohibits any alcohol consumption or food preparation. Only one serving of meat is included per day, and she must meditate for at least five minutes daily.
The mother of two wrote on her site, "This programme allowed me to work and exercise regularly, some think I cannot do if I am on a liquid only detox. I followed it to the letter and I feel pure and happy and much lighter."
Gwyneth Paltrow is currently filming the Iron Man sequel with Robert Downey Jr. The film is set to be released in May 2010.