Better for blood sugar

The glycemic index (GI) is a measure of how much a food elevates blood sugar. It runs from 0 to 100, with a GI of 70 considered high. Purple potatoes have a GI of 77, yellow potatoes have a GI of 81, and white potatoes have a GI of 93, according to a human comparison study.

While all potato varieties have an influence on blood sugar levels due to their carbohydrate content, purple potatoes may have a lower effect than other types due to their high concentration of polyphenol plant components. These chemicals may reduce carbohydrate absorption in the intestines, reducing the influence of purple potatoes on blood sugar levels. An animal study found that giving purple potato extract to rats resulted in enhanced glucose tolerance and short and long-term blood sugar levels.