What is meant by low glycemic index foods and why they are good for health

A low-glycemic index (low-GI) diet is a meal plan focused on how foods impact blood sugar levels, also known as blood glucose levels. The glycemic index ranks foods on a scale from 0 to 100. However, the foods at the lower end of the scale have minimal impact on blood sugar, while those at the higher end cause a more significant increase in blood sugar.