Yes, why not type-2 diabetes people can eat banana but quantity does matters. In fact Banana is very nutritious(rich source of iron, vitamins, calcium, potassium, protein) fruit can be eaten very easily, great in hygiene.
In diabetes it is myth that diabetic people should not eat Banana(sweet fruits). Fact is that total amount of carbohydrate in a food affect blood sugar is more than other sources of carbohydrate like sugar. For diabetic people one serving of fruit should contain 15 gm carbohydrate. The size of the serving depends on the carbohydrate content of the fruit. If some fruit contains less carbohydrate then that can be eaten in more quantity.
Estimated carbohydrate quantity in banana
- Extra small banana (6 inches long or less) — 18.5 grams
- Small banana (about 6-6 7/8 inches long) — 23 grams
- Medium banana (7-7 7/8 inches long) — 27 grams
- Large banana (8-8 7/8 inches long) — 31 grams
- large banana (9 inches or longer) — 35 grams
Above is estimated quantity of carbohydrate in banana and using this you can calculate how much banana can be eaten by type-2 diabetic person in a day.
So for 15 gm carbohydrate intake 4-5 inch banana will be sufficient. So you can eat a small banana or 1/2 medium sized banana. but you have to cut other carbohydrate intake to balance your diet.