How does the Glycemic Index (GI) of purple potatoes compare to white potatoes when measuring blood sugar impact?

Purple potatoes register a lower GI (around 77) than white potatoes (93).

Purple potatoes demonstrate a more favorable profile regarding blood sugar response when measured by the Glycemic Index (GI). Studies indicate that purple varieties register a GI value centering around 77. This value is notably lower than that associated with yellow potatoes (81) and significantly lower than white potatoes, which typically score a GI of 93. This metabolic advantage is hypothesized to be linked to the abundance of polyphenol compounds within the purple tubers. These polyphenols are believed to interact within the digestive system in a way that slows down the rate at which starches are absorbed into the bloodstream, consequently minimizing sharp spikes in blood sugar levels following consumption.