The Glycemic Index or GI is a measure that ranks carbohydrate-containing foods based on how they affect blood sugar levels when consumed. High-GI food can cause a rapid spike in blood glucose levels, followed by a swift decline. Moreover, these high-GI foods stimulate an increased demand for insulin, contributing to the risk of developing type-2 diabetes. Importantly, low-GI food helps to prevent diabetes, heart disease, obesity, and cancer.