In February 2019 researchers from the UK published the results of their study to assess the glycaemic index and load of two commercial fruit smoothies and the amount of dietary fibre retained following production. Results showed that dietary fibre was still present in the smoothies after processing. The glycaemic index was low for both smoothies, whereas the glycaemic load was medium and borderline-low. It was the view of the researchers that retention of fibre in these smoothies may potentially have a positive effect on glycaemic response and may contribute to daily fibre requirements.
Saltaouras G et al. Glycaemic index, glycaemic load and dietary fibre characteristics of two commercially available fruit smoothies. Int J Food Sci Nutr. 2019 Feb;70(1):116-123.