Dr Idz cleared up the claims by pointing to a controlled trial which compared the blood sugar effect of eating whole and blended apples and blackberries. It found that blended fruits actually resulted in a 15% lower blood sugar spike, with the research suggesting that the reduction was down to that fibre being dispersed around the drink.

That’s seconded by Sophie Medlin, director and specialist dietitian at CityDietitians. “Firstly, there is evidence that smoothies cause less of an increase in blood sugars than whole fruit does,” she says. “This is thought to be because the fibre is dispersed amongst the fructose from the fruit, allowing us to process it more slowly. Adding protein will further dampen any increase in blood sugars.

“Secondly, we don’t need to worry about normal fluctuations in blood glucose from things like fruits or smoothies because people who are free from diabetes are perfectly capable of managing this without any harm being caused.”

Do smoothies really spike your blood sugar? Nutritionists explain the impact of blitzing fruit and veg