The diet reportedly followed by the Duchess of Cambridge's mother Carole Middleton has been branded "confusing, rigid and ineffective" by the British Dietetic Association (BDA).
In the BDA'S of five worst celebrity diets to avoid in the New Year, the experts named the Dukan Diet the worst weight-loss plan with "absolutely no solid science behind it at all".
The Dukan Diet, which is a four-phase diet that kicks off with a protein-only week, was described by the BDA as "so confusing, very rigid, full of very French foods that most Brits would run a mile from like rabbit and offal, and even Dr Dukan himself warns of the associated problems like lack of energy, constipation and bad breath."
The other celebrity diet fails in the list were:
- Alcorexia diet
- The Blood Group diet
- The Raw Food diet
- The Baby Food diet
Watch the video above of nutritionist Joanna McMillan to learn more.