Anyone with a serious condition should check with their health provider before embarking on any type of fasting.
The issue in IF is that diabetics have problem with the malfunctioning of insulin. Either the pancreas is not producing, or is not effective. Insulin is needed to regulate the build-up of ketone bodies, in case it gets too much (ketoacidosis).
I personally will not advise diabetics to embark on IF.😙😙