Now the Duchess of Cambridge is apparently undergoing hypnotherapy to help her to regain her appetite.

Catherine Middleton has suffered from severe morning sickness while pregnant with her and husband Prince William's first child.

Her friend Jessica Hay has spoken about the methods the mother-to-be is employing in order to restore a healthy relationship with food.

"She still looks at food and feels nauseous," Jessica has said.

"She has that feeling you have when you've had food poisoning and your stomach has shrunk... so she is using hypnotherapy in a bid to help with her appetite."

Kate has been suffering from a severe strain of morning sickness also known as hyperemesis gravidarum, which has apparently left the already slim 31-year-old shying away from food.

According to her friend the therapy is already working and helping to encourage her to eat wholesome and healthy food such as avocados, broccoli, oatmeal and even drinking smoothies.

It's great news that Kate has sought help with her problem. Hypnotherapy and hypnosis can be very useful during pregnancy and not just for the food and eating problems. Giving birth can be a very stressful time and Natal Hypnotherapy can really help you to relax and look forward to, and even enjoy the moment of birth, with less pain and worry.

"Kate 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."

"All in all, Catherine's very happy," she has said. "With so much family around her and William, they're starting to enjoy the pregnancy after such a traumatic start."