Yes, fruit can cause diabetes.
The carbohydrate content of an apple is 21 g (60 kJ) its glycemic index is 32, which also determines its effect on blood-sugar levels. Eating an apple would spike insulin considerably more than eating a Quest bar for example; something that supposedly can’t happen because of “slow-release carbs”. And then there are the fructose molecules that the intestinal absorbents cannot process and convert to usable energy due to lack of ATPase enzyme needed for hexokinase enzymes not functioning properly
Not so slow release.