Should you tell people they smell diabetic?

Not sure if I'm mad, but there is a sweet smell around people with Type 2 diabetes. I don't know what my success rate is with sniffing it out, but everyone I know who has a confirmed diagnosis, I have been able to smell it on them.

If you smell someone with this smell, should you tell them, is there a way to bring this up sensitively.

Or am I just mad.