The British Dietetic Association has composed a list of the worst 5 celebrity diets of 2011.
The Dukan Diet
Rumoured Celebrity Users: Kate Middleton, Jennifer Lopez
Developed by Dr Pierre Dukan, this diet is now extremely popular in France with Dukan himself warns of its side effects of a lack of energy, bad breath and constipation.
The four-phase diet, which is also reported to be followed by actress Jennifer Lopez and supermodel Gisele Bundchen, starts with 72 high-protein foods for quick weight loss, followed by “pure protein” days alternating with proteins accompanied by vegetables.
The Baby Food Diet
Rumoured Celebrity Users: Lady Gaga
This diet requires users to consume up to 14 jars or baby food or puree per day. This restrictive diets provides few calories and lacks the essential nutritional values required for adults.
The Blood Group Diet
Rumoured Celebrity Users: Cheryl Cole
This diet works on the premise the different blood groups require different foods in order to lose weight. This diet has no scientific evidence to back its claims and will leave users deficient in a number of key nutrients.
This diet restricts the caloric intake from food consumption during the day so users can drink more alcohol without gaining weight. This extreme diet could result in alcohol poisoning and even death.
The Raw Food Diet
Rumoured Celebrity Users: Demi Moore, Natalie Portman
This diet focuses on the user only being able to eat raw food and only unpasteurised dairy products.
This approach leaves many nutritious foods unavailable for consumption or and even a risk of food poisoning.