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Comparison of blood glucose response between Jimmy Joy Plenny Shake and white bread, over 120 minutes
Introduction
White bread is comparable to glucose in providing the highest possible glycemic index. This can be explained by the composition of bread, which is mainly large chains of glucose. In contrast, foods with a low GI contain complex carbohydrates, a complex nutrient profile and a high fibre content. This is also the case for Plenny Shake v3.0. Figure 1 shows how blood glucose levels differ for low and high GI foods. To check whether the composition of Plenny Shake really has an effect on blood glucose levels compatible with low GI foods, it is useful to compare Plenny Shake with a high GI food to detect the differences and draw a conclusion about the GI of Plenny Shake (1–4).
Research Question: What is the effect on blood glucose levels of Plenny Shake v3.0 compared to high GI foods?
Hypothesis: The trend of increasing blood glucose of Plenny Shake v3.0 is consistent with the low GI line (Figure 1).
Method
Results
Table 1 shows the recorded area under the curve (AUC) and its mean for Part 1 (Plenny Shake v3.0) at 15-minute intervals for 120 minutes (n = 9).
Table 1: Area under the curve (AUC) of blood glucose levels as a result of consuming Plenny Shake v3.0 for 15 minutes (min.)
The AUC and mean values recorded in Part 2 (white bread) are shown in Table 2.
Table 2: Area under the curve (AUC) of blood glucose levels as a result of white bread consumption. white bread
The results are graphically illustrated in Figure 2, which shows the comparison of blood glucose response between white bread and Jimmy Joy Plenny Shake v3.0 (n = 9).
Figure 2: Effect of Plenny Shake v3.0 and white bread on blood glucose levels.
Outliers
Two participants showed blood glucose values that were significantly different from the other observations. When these participants were excluded from the study, a faster peak and fall became visible after consumption of white bread. However, the effect on blood glucose after Plenny Shake consumption remained roughly similar to when the outliers were included. Figure 3 shows the results graphically illustrated when the outliers are excluded from the results.
Figure 3: Effect of Plenny Shake v3.0 and white bread on blood glucose levels with outliers excluded.
Conclusion
Blood glucose levels recorded during part 1 (Plenny Shake v3.0) of the test showed a slow rise and a slow fall. When these graphs are compared (Figure 4 and 5), this line is compatible with the low GI line. In contrast, blood glucose levels recorded in part 2 of the test (white bread), showed a rapid rise, resulting in a peak rise at 45 minutes after consumption. After these 45 minutes, blood glucose levels dropped rapidly. This result is comparable with the high GI line. In conclusion, it is shown that Plenny Shake v3.0 behaves as a low glycemic index food.
Sources
- Harvard Nutrition Source. A good guide to good carbs: The glycemic index [Internet]. Harvard Health. [cited 2020 Apr 9].
- Harvard Nutrition Source. Choosing good carbs with the glycemic index [Internet]. Harvard Health. [cited 2020 Sep 26].
- Miller JB, Pang E, Bramall L. Rice: a high or low glycemic index food? Am J Clin Nutr. 1992 Dec 1;56(6):1034–6.
- Jenkins DJ, Wolever TM, Taylor RH, Barker H, Fielden H, Baldwin JM, et al. Glycemic index of foods: a physiological basis for carbohydrate exchange. Am J Clin Nutr. 1981 Mar 1;34(3):362–6.
