Gwyneth - who also has a daughter, Apple, from her marriage to Chris - also has to take herbal supplements to flush out toxins and have regular colonic irrigation, reflexology and cupping treatments.

The source added: "Gwyneth has been wearing corsets to make her appear slightly thinner but she can't wait to bin them when the diet is finished."

Dr Joshi charges £750 for a detox diet and treatments and his other clients include actress Cate Blanchett, British actor Rupert Everett and supermodel Kate Moss.