Taken from the BSAC website:
DIABETES & DIVING
Diabetes does not necessarily prevent a member from taking up diving, or for existing members continuing to dive if they contract the condition.
The UKSDMC have devised a specific process for diabetics to follow to determine their suitability for diving. There is a designated Medical Referee that deals with these enquiries and the 'Diabetes Pack' can be downloaded here:
http://www.bsac.org/uploads/document...abeticpack.zip