“…Similarly, various biomarkers that are related to acute cognitive performance and/ or postprandial glycaemia could be measured, such as heart rate variability, insulin, glucagon, glucagon-like peptide-1, free fatty acids, or cortisol (Dybjer et al, 2020;Nilsson et al, 2008;Saito et al, 2018). Lastly, several studies have reported that the gut microbiome plays a key role in postprandial glycaemia (Berry et al, 2020;Mendes-Soares et al, 2019;Zeevi et al, 2015), and as such may influence the cognitive response to variations in breakfast GL. This could be investigated by administering different dietary fibres.…”