sf wrote:
>
> Sometimes I have a metallic taste in my mouth, but the dentist says
> there's no reason for it.

There are plenty of possible causes. One is low carbing. Run out of
stored carbs in the body and there is a switch to burning fat as the
main fuel. The slow fat burning path is to convert the fatty acids to
actyl-CoA which is used directly in the mitrochondria. That path does
not produce the smell. That path is the only one used to burn fat when
there are stored carbs present. The fast path is to convert the fatty
acids to several types of ketones. One ketone is acetone and that's the
one that puts a taste in the mouth. Some call it metallic, some call it
garlicy, some call it sour. Dragon breath. It can happen in the
morning if you had a low carb dinner. If this is the cause it's not a
problem. Natural result of a successful predator diet or of a fast.