Many animals, including humans, obtain nutrition from plants. Carbohydrate availability from such foods is measured as GI (glycemic index), but instead of simple sugars such as sucrose or glucose, the major source of blood sugar in foods is

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The major source of blood sugar in foods, especially those derived from plants, is starch. Starch is a complex carbohydrate that, when digested, breaks down into glucose, which is a primary source of energy for the body.

Many Animals, Including Humans, Obtain Nutrition from Plants