Academic article

Glyceamic and insulinaemic response to mashed potato alone, or with broccoli, broccoli fibre or cellulose in healthy adults

Ballance, Simon; Knutsen, Svein Halvor; Fosvold, Øivind Winther; Wickham, Martin; Trenado, Carmen Diaz-Toledo; Monro, John

Publication details

Journal: European Journal of Nutrition, vol. 57, p. 199–207, Wednesday 21. September 2016

Issue: 1

International Standard Numbers:
Printed: 1436-6207
Electronic: 1436-6215

Open Access: none

Links:
DOI

Purpose
To examine the role of realistic serving sizes of
broccoli, broccoli fibre and cellulose co-consumed with
mash potato, or mashed potato eaten alone, on glycaemic
and insulinaemic responses (GR and IR) in healthy adults.
Method
A non-blind randomized crossover trial was conducted
with thirteen healthy subjects consuming four different
meals. Capillary blood samples between 0 and 180 min were analysed for glucose and insulin. The incremental
area under the fasting blood glucose and insulin
curves (iAUC) was calculated for different time increments.
Differences in GR and IR between meals were assessed by
repeated measures analysis of variance.
Results
The immediate GR and IR to one serving of
mashed potato eaten with two servings of broccoli were
significantly lower than mashed potato eaten alone. The
peak, incremental peak and iAUC0–30min for GR and
iAUC0–30min for IR were all significantly lower for the broccoli– potato meal. This meal also takes longer to return
to fasting baseline with a time-delayed lag in IR and GR
compared to the potato only meal. The iAUC60–120min for
IR was significantly greater for the broccoli–potato meal
compared to the other meals. Yet there was no corresponding
significant difference between the broccoli–potato meal
and the other meals for peak, incremental peak IR or anyother iAUCs for GR and IR. For the potato meals containing
added broccoli fibre or cellulose, no significant differences
in GR or IR were observed when compared with the
potato eaten alone. Conclusion Co-consumption of cooked broccoli With mashed potato has a significant effect on glycaemic and insulinaemic responses compared to potato eaten alone. Our study suggests broccoli eaten with potato improves glucose homeostasis and therefore indicates a general beneficial utritional role for broccoli when eaten with a carbohydrate staple.