Fruits high in fructose are beneficial to diabetics because fructose does not require insulin
for metabolisation.Fructose also has a much lower glycemic index
of 19 compared to glucose
or sucrose (table sugar) which have GI values of 100 and 60 respectively. This means high fructose fruits will not spike blood sugar levels to the same extent as high glucose fruits. High fructose fruits include apples, cherries, pears, guavas etc.
Fruits with high amounts of the sugars glucose and sucrose tend to have high GI values and should either be avoided or be eaten in small amounts as they can spike blood glucose levels very quickly. High GI fruits include bananas, dates, grapes, watermelon, pineapples, and oranges.
I hope it helps.