Alec Baldwin
Alec Baldwin's diet has been panned by the British Dietetic Association Reuters

As the end-of-year awards season reaches full swing, you could be forgiven for overlooking the British Dietetic Association (BDA)'s 2016 five worst celebrity diets. Rest assured: IBTimes UK has not.

So, which famous faces have converted to diet pills? And who really needs to "go easy" on the kale? Starting with the worst offenders, here are the 2016 worst celebrity diets along with insider analysis from the BDA:

1. No Sugar diet

Celebrities reported to have followed this "diet": Tom Hanks and Alec Baldwin

What's it all about? The Sugar Free Diet involves exluding all types of sugar (and often all carbohydrates) from your diet.

BDA Verdict: "Cutting down on free sugars, reducing the amount of sugar you add, and consuming fewer products already containing added sugar, in addition to being label aware is definitely a positive. However, some versions of the No Sugar/Sugar Free Diet promote cutting out all sugar from your diet which is not only almost impossible, but would mean eliminating foods like vegetables, fruit, dairy products, nuts – leading to a less than healthy diet."

2. The all-kale and chewing gum diet

Celebrities reported to have followed this 'diet': Jake Gyllenhaal

Jake Gyllenhaal
Jake Gyllenhall has allegedly been gorging on kale Neilson Barnard / Getty

What's it all about? A diet consisting entirely of kale and chewing gum.

BDA Verdict: "This diet is extreme, socially isolating, unbalanced, hard to sustain and potentially harmful. An actor would be carefully monitored and supervised to shed weight for a role. Many people get drawn in by so called 'super foods' but no one food can provide all the nutrients you need. These foods are not a magic bullet, neither does balanced nutrition work by a 'good' food cancelling out other poor dietary and lifestyle choices. Nothing is wrong with kale, but if that is all you consume all day, every day, then problems will arise –it's all about balance, a healthy relationship with food and variety."

3. Bulletproof diet

Celebrities reported to have followed this 'diet': Harry Styles and Shailene Woodley

Harry Styles solo
Too much 'Bulletproof' coffee for Harry Styles? Christopher Polk/Getty Images

What's it all about? This diet plan includes a daily "Bulletproof coffee" which is essentially a black coffee with 2 tbsp butter, and a tbsp MCT oil.

BDA Verdict: "Whilst the idea of minimising alcohol and processed food is positive, the classification of foods is at odds with health recommendations and lacks evidence. Time restricted eating is also at odds with many lifestyles. The negative of the recommended Bulletproof coffee is that consuming 400+ calories from one beverage provides a lot of energy but few nutrients from a drink, rather than individuals choosing food and drink with more nutritional content for the same calorie value."

4. The Super Elixir

Celebrities reported to have followed this "diet": Elle MacPherson is the co-founder and Creative Director of this product.

Elle Macpherson
Elle Macpherson's 'Super-Elixir' did not meet with the total approval of the experts Getty Images

What's it all about? "The Super Elixir" is a food supplement aiming to change body tissue from an acidic to an alkaline state. It comes in the form of a green powder and contains just over 45 ingredients including a number of powdered fruits and vegetables, sweeteners, several Chinese herbs and some digestive enzymes.

BDA Verdict: "The benefits that this costly powder claims to provide can easily be obtained from fruit and vegetables and a balanced diet, without the hefty price tag. Moreover our bodies are naturally capable of regulating acidity levels. Why not save between £750-£1,152 per year, spend it on some delicious fruit and vegetables and a splurge on a 'Super' holiday instead!"

5. Trim Secrets

Celebrities reported to have followed this "diet": Chanelle Hayes (former Big Brother star) while Baroness Michelle Mone OBE established Trim Secrets

chanelle hayes
Chanelle Hayes's choice of diet pills have been criticised by dietitians ITV

What's it all about? Trim Secrets is a pill which claims to suppress appetite whilst boosting the metabolism, allegedly aiding both men and women to lose weight when combined with the Trim Secrets 5 stage diet plan.

BDA Verdict: "By consuming 1,500 calories per day, most individuals should lose weight regardless of whether they are taking this pill, and that's no secret. The pill has echoes of the grapefruit diet and includes guarana which is high in caffeine yet states it's caffeine free. Beware of pills and potions and make sure you know exactly what you are buying and taking."

Sian Porter, consultant dietitian and spokesperson for the BDA, said: "The bottom line is, if it sounds too good to be true, then it probably is. The simple fact is, there is no 'wonder diet' just as there are no 'super foods' and no one diet fits all.

"What is super, is the way many marketing machines coin certain phrases to make you think there is some magic wand approach to losing weight."