Weight loss diets are set to be all the rage come January as Britons attempt to shed excess Christmas pounds.
However, experts have warned of the trendy eating regimes that could cause more harm than good.
The British Dietetics Association (BDA) have released a list of diets that the nation should avoid in the New Year.
Sian Porter, from the BDA, told the BBC: “If something sounds too good to be true, it probably is.”
In a fact sheet on their website the BDA recommend slimming down safely by setting realistic goals, not eating while watching TV and half filling your plate with vegetables for all meals.
Would you be tempted to try these five diets on the BDA’s blacklist?
This diet combines two concepts – veganism and raw foodism – and celebrity fans include Gwyneth Paltrow and Sting.
It involves cutting out all animal products as well as avoiding cooking.
This includes not eating anything refined, canned, chemically processed or heated above 48C.
By doing so, it is thought that food retains as many nutrients as possible, since cooking is said to destroy the natural enzymes in the food that helps your body to break it down.
However, following a vegan diet – devoid of eggs, cheese, meat, milk, fish and honey among other products – could place people at risk of missing out on certain nutrients.
These include vitamin B12 and vitamin D, according to the NHS, which are richer in animal products.
What’s more, there is research to suggest that the cooking process releases some of the nutrients in foods like spinach, carrots, peppers and asparagus.
The eating regime followed by Tom Brady, the Duchess of York and nutritionist Natasha Corrett, is based on the idea that altering your diet can change the pH balance – or level of acidity – in your body.
Too much acid in the body is claimed to trigger arthritis, kidney disease, osteoporosis and cancer.
Eating more ‘alkaline foods’ such as fruit and vegetables could redress the balance, say fans. There is, as yet, no evidence to support the theory you can change the acidity of your body and blood through diet.
Alkaline eating was also criticised in a recent BBC documentary, Clean Eating: The Dirty Truth, for being used as a way to cure very ill people, revealing that its founder, Robert O. Young, is currently facing a jail sentence for fraud and practicing medicine without a licence.
But eating more fruit and vegetables does have benefits, including reducing risk of cancer and a number of other conditions.
Taking inspiration from the Mediterranean diet – which advocates lots of olive oil, vegetables and oily fish – this diet is purported to aid weight loss, prevent dementia and reduce risk of type 2 diabetes.
It is named after a small village in southern Italy where locals tend to live longer and avoid chronic diseases.
The Pioppi diet recommends a low-carbohydrate, high-fat diet with fruit and vegetables, fish, olive oil, alcohol in moderation.
Additionally, the creators Dr Aseem Malhotra and Donal O’Neill, advise intermittent fasting and encourage people to avoid red meat, starchy carbohydrates and sugary foods.
However, the BDA suggested to the BBC they are “hijacking” the Mediterranean diet.
They criticised the inclusion of coconut oil, which is high in saturated fat, and cauliflower as a pizza base.
The Mediterranean diet traditionally includes lots of olive oil and carbohydrates, such as pasta and rice at every meal.
Following the Mediterranean diet has been found by studies to reduce the likelihood you will suffer heart disease, depression and dementia.
The low-carb, high-fat, moderate-protein ‘Keto’ diet has been famously followed by Kim Kardashian and Alec Baldwin.
By consuming carbohydrates from exclusively non-starchy vegetables, nuts and seeds, it pushes the body into a state of ‘ketosis’.
This is where the body can’t get energy from the glucose in carbohydrates so it needs to break down fat instead.
Porter said to the BBC: “The sinister thing here is people saying it can cure cancer and things like that – it absolutely cannot.”
While reducing carbs could mean reducing high-calorie items like creamy pasta sauces and sugary biscuits, people risk missing out on fibre.
Whole grains are a great source of fibre, and recent research has suggested that many Britons are not consuming enough, therefore risking constipation and bowel cancer.