The Duchess of Cambridge is apparently undergoing hypnotherapy after her bout of hyperemesis gravidarum (acute morning sickness).
The royal's friend Jessica Hay reportedly told Australia's New Idea magazine that the treatment was helping the Duchess overcome her negative thoughts of food after she was hospitalized.
"Kate still looks at food and feels nauseous," Hay was quoted by the Evening Standard as saying.
"She's been plagued with that feeling you have when you've had food poisoning and your stomach's shrunk."
She added: "She finds it very hard to eat a full meal and gets full very quickly.
"The hypnotherapy is taking away any negative thoughts connected with food from the morning sickness, and replacing them with cravings for healthy, nutritious food."
Hay said: "All in all, Catherine's very happy. With so much family around her and William, they're starting to enjoy the pregnancy after such a traumatic start."
Prince William and Kate announced their pregnancy on December 3 - earlier than the usual 12-week point after Kate was taken to hospital.
[The Duchess of Cambridge with Olympian Jessica Ennis]
Kate left London's King Edward VII Hospital three days later and later stayed at Kensington Palace for a period of rest.
She made her first public outing since her stay in hospital at last month's BBC Sports Personality of the Year Awards.
The first official portrait of the Duchess, painted by Paul Emsley, was unveiled earlier this month.