Relative glycemic impact

Relevance to potatoes Unlike Gl, RGI refers to the relative glycemic effect of the entire food, and depends on food quantity consumed (Table 13.2), so it allows a direct comparison ofthe relative glycemic impact of any amount of potato, such as a serving or lOOg, with a serving or any other amount of another food (Table 13.2). For potato RGI is much lower than Gl because fresh potatoes contain only about 20% available carbohydrate. 

Definition A single unit of RGI. One GGE unit is equivalent in glycemic effect to one gram of glucose. For example, one microwaved potato (Table 13.2) with a relative glycemic impact (RGI) of 15 GGE would... 

Relevance to potatoes Because it has weight units GGE can be used as if it were a food component, but representing glycemic impact. It allows the relative effect of a food to be shown concurrently with nutrient values for the food in food composition tables (e.g. Table 13.2), so has been termed a Virtual Food Component (Monro, 2004). 

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