Gem GI is a clear introduction to what a GI diet is and how it works. It explains the difference between the glycemic index of a food and its glycemic load. The GI food counter rates hundreds of foods using a simple traffic-light system: red for foods to avoid, amber for foods to eat occasionally and green for foods to focus on.

Contains a clear introduction to GI diets and how they work. Cuts through the jargon associated with technical sounding terms such as glycemic index and loads.