Invented in Australia, the shakes contain chocolate, sweets, cake, whipped cream, ice cream and sugary sauce.
Campaign group Action on Sugar has today demanded a ban on freakshakes, in addition to any milkshakes containing more than 300 calories.
The worst offending freakshake, the Toby Carvery Unicorn Freakshake, was found to contain 39 teaspoons of sugar and 1,280 calories per drink – the equivalent to drinking four cans of cola.
The daily recommended calorie intake is 2,500 for a man and 2,000 for a woman.
But how much exercise would you have to do to work off just one of these drinks?
How much exercise to burn off a freakshake?
An average 35-year-old woman would have to cycle on an exercise bike at medium intensity for two hours and 45 minutes in order to burn off these calories, or to run at a medium pace for an hour and a half.
Meanwhile, an average 35-year-old man would have to cycle on an exercise bike at medium intensity for two hours and 30 minutes, or to run at average intensity for one hour and 20 minutes.
While it is possible to burn off the calories from a freakshake, it is clear most of us do not fit this much exercise into our day.
What’s more, there is no accounting for the impact eating this much sugar can have on your body and your teeth.
Nutritionist Jenna Hope told Yahoo Style UK: “Calories are not all equal and whilst we have to be aware of them to some degree it’s more important that we focus on the quality of the calories.
“Calories from sugar provide no nutritional value but they can stimulate appetite which can cause you to over consume.
“High sugar intakes (especially in one sitting) can contribute to an increased risk of type 2 diabetes.
“Sugar is a carbohydrate although you’re better off to focus on consuming carbohydrates in the form of complex carbohydrates (e.g. brown bread, brown pasta, brown rice, quinoa and starchy vegetables) and fibre as these are released into the blood at a slower rate meaning they’ll keep you fuller for longer and help to control appetite.
“The daily recommendations suggest that sugar shouldn’t contribute to more than 5% of your total calorie intake (e.g. around 30g per day).”
—Watch the latest videos from Yahoo—
If you are concerned about the amount of sugar you eat or would like to learn more, head to the Action on Sugar website.
Read more from Yahoo Style UK: