Diseases and Aviation

[jayson]

nowadays suffering from diseases (if you can call them) like diabetes and blood pressure is quite common.
therefore in such a scenario can a pilot who has gained tremendous flying experience all his life but is now suffering from diabetes or blood pressure will be allowed to fly?

and if no, will that be the end of his career? (sounds scary enough)

[effortless]

If I recall you can't even drive a heavy goods if you are insulin dependent. This said then you cannot even get an NPPL with it.