Key result
High-sugar meals are linked to increased middle cerebral artery velocity in young but not middle-aged adults.
Why the study?
High-sugar mixed meals elicit mixed vascular effects, but whether they cause segment-specific cerebrovascular effects and whether responses differ between young healthy adults and middle-aged adults with cardiometabolic risk factors was unclear.
Does a high-sugar mixed meal alter cerebrovascular haemodynamics differently in young healthy adults compared to middle-aged adults with cardiometabolic risk factors?
Observational (n=41)
Does a high-sugar mixed meal alter cerebrovascular haemodynamics differently in young healthy adults compared to middle-aged adults with cardiometabolic risk factors?
A high-sugar mixed meal induces different intracranial cerebrovascular haemodynamic responses in young healthy adults compared to middle-aged adults with cardiometabolic risk factors.
Answers are grounded in this paper and cite their sources.
High-sugar meals were associated with cerebrovascular changes only in young adults; hypothesis-generating for differential responses in CMD risk, needs confirmation.
Consumption of a high-sugar mixed meal (HSMM) increases both glucose and insulin and elicits mixed vascular effects, with reduced microvascular blood flow but increased conduit artery diameter and blood flow. In this study, we sought to examine: (1) whether an HSMM elicits vascular segment-specific effects within cerebrovasculature; and (2) whether these responses differ between young healthy adults and middle-aged adults with cardiometabolic disease (CMD) risk factors. Twenty-one young, healthy adults (ages 18-39 years; 24 ± 6 years) and 20 middle-aged adults (ages 40-65 years; 55 ± 5 years) with CMD risk factors (hypertension, obesity or dyslipidaemia) underwent cerebrovascular assessments before and at 30 and 60 min after a 930 kcal HSMM. Carotid and aortic stiffness and carotid artery characteristic impedance were assessed via ultrasound and tonometry. Middle cerebral artery mean velocity, pulsatility index and resistive index were assessed via transcranial Doppler. In comparison to baseline, common carotid artery diameter increased while stiffness decreased, contributing to a decrease in carotid artery characteristic impedance in both groups following the HSMM (p < 0.05). In comparison to baseline, middle cerebral artery mean velocity, pulsatility index and resistive index increased only in young adults (p < 0.05) following the HSMM. Differential increases in cerebral pulsatility among young adults compared with middle-aged adults with CMD risk factors might reflect modest differences in upstream, extracranial artery pulsatile transmission following an HSMM, along with simultaneous, complex intracranial cerebrovascular responses that require further interrogation. Cumulatively, these data suggest that: (1) the cerebrovascular response to an HSMM might differ between segments of the extra- versus intracranial cerebrovasculature; and (2) middle-aged adults with CMD risk factors might have altered cerebrovascular responsiveness to an HSMM compared with young, healthy adults.
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Reed et al. (2025) conducted an observational in Cardiometabolic disease risk factors (n=41). High-sugar mixed meal (HSMM) vs. Baseline and between-group (young vs middle-aged) was evaluated on Cerebrovascular haemodynamics (carotid/aortic stiffness, middle cerebral artery velocity, pulsatility index, resistive index) (p=<0.05). A 930 kcal high-sugar mixed meal increased middle cerebral artery mean velocity, pulsatility index, and resistive index in young healthy adults, but not in middle-aged adults with CMD risk factors.
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