Discussion
Which of the following has the highest glycemic index ?
Answer: D
Of these foods, watermelon has the highest glycaemic index.
The glycaemic index (GI) ranks foods by how fast their carbohydrate raises blood glucose compared with pure glucose (100). Watermelon has a high GI, around 72 to 76 in the standard tables, because its carbohydrate is mostly free sugars in water with almost no fat, protein or fibre to slow absorption. Its glycaemic load is low, though, because a serving holds little carbohydrate.
Bread also has a high GI, about 70 for white bread, so it is close but lower. Ice cream is low to medium (about 50 to 60), because its fat slows digestion, and cucumber has very little carbohydrate and a low GI.
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