The Glycemic Index (GI) is a tool that measures how carbohydrates affect blood glucose levels. High GI carbohydrates cause blood sugar levels to spike and then crash, whereas low GI foods are digested and absorbed more slowly.
Lowering the GI of your diet will help prevent and manage overweight and obesity, which are the major underlying causes of diabetes, heart disease and some cancers.
A few examples of very high GI food: (more at https://glycemicindex.com/gi-search/)
Sugar blend: 163 Sucrose: 139
Gluten-free bread: 131 Potato: 120
Beer: 119 Jasmine rice: 116
Source:
https://glycemicindex.com/ (of The University of Sydney)