How Does Watermelon Affect Blood Sugar?
For people with diabetes, the glycemic index (GI) can help estimate how a food might affect blood sugar, but it doesn't tell the whole story.
“GI is not always a reliable indicator of blood sugar responses,” said Samantha M. Coogan, MS, RDN, LD, director of the Didactic Program in Nutrition and Dietetics at the University of Nevada in Las Vegas.
Coogan said GI doesn't consider cooking methods, food combinations, or digestive differences. While GI shows how fast food can raise blood sugar, glycemic load (GL) measures how many carbohydrates a typical serving has.
Watermelon has a high GI of 72 but a low GL of around 5 per 120-gram serving. Because of watermelon’s high water content (91%), a standard serving is unlikely to cause a sharp blood sugar spike.
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