Banana Glycemic Index

Banana GI ranges from about 42 to 62 depending on ripeness. A medium-ripe yellow banana typically has a GI around 51–55, which is low. Green (underripe) bananas are lower at about 42, while overripe bananas with brown spots can reach 62, entering the medium range. Because ripeness genuinely changes the GI, we report the full range rather than a single number.

Bananas are not inherently bad for people with diabetes, but portion size and ripeness matter. A medium banana has a glycemic load of about 12, which is moderate. Choosing smaller bananas or half a banana, selecting greener ones, and pairing with protein or fat all help manage blood sugar impact. People with diabetes should discuss fruit choices with their care team — this is general nutrition information.

Yes. Green bananas have a GI of about 42 because they contain more resistant starch and less free sugar. As bananas ripen, starches convert to simple sugars, raising the GI to around 62 for very ripe bananas. Green bananas also provide more prebiotic fiber, which supports gut health. For lower blood sugar impact, choose bananas that are still slightly green at the tips.

Apples have a lower GI (around 36–40) and a lower glycemic load (about 6 for a medium apple) compared to bananas (GI 42–62, GL about 12). Apples also have more fiber per carb gram. For tighter blood sugar control, apples are generally the better choice. However, bananas provide more potassium and vitamin B6, so both can fit into a balanced diet with appropriate portions.

A medium banana contains about 24 g net carbs, which uses a significant portion of a low-carb daily budget. On a moderate low-carb plan (50–100 g net carbs/day), half a banana can fit. On strict keto (under 20–30 g/day), even half a banana is difficult to accommodate. Most low-carb and keto diets limit or avoid bananas in favor of lower-carb fruits like berries.