How does the Glycemic Index (GI) typically change as a banana ripens from green to fully yellow?
Answer
The GI rises from a low range (as low as 47) to a medium range (around 57)
The ripeness of a banana directly impacts its Glycemic Index (GI) because of the ongoing conversion of starches into simpler sugars. Green or less ripe bananas exhibit a low GI, often reported as low as 47, due to high levels of resistant starch and soluble fiber that slow digestion. As the fruit ripens, this resistant starch converts into simpler, readily available sugars. Consequently, this conversion causes the GI value to increase, eventually settling into a medium range, typically around 57 for overripe bananas. This shift means a greener banana provides a slower, more sustained energy release compared to a fully yellow one.
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