The glycemic index of pasta is going to vary with the type of flour and other ingredients you add (such as egg) as well as the shape and size of the pasta. However, the ones that have the lowest GI tend to be made from durum wheat flour. According to the below article, the starch and proteins in the durum wheat flour form a gluten structure which is harder to break down than other wheat and white flour food products – which leads to the lower GI.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8623826/
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