Indeed @gennepher .So, I have just now copied and texted your longer post on here with the link to the film to her. You did want the B12 message passing on, so I am assuming that is okay.
It seems such a common yet easily fixable issue if people are aware and request a test if suspicious.
I think we're lucky as since T2D I now know I can request a test to monitor my levels each year.
A side note was due to mums condition, I had read (but not verified) that some refer to dementia/Alzheimer's as a type of diabetes .
And the thought that if the excess glucose can cause issue to our limbs, what on earth could it do to such a sensitive piece of equipment like our brains & thought processes. Mmmh
To whit I read (please look for links ) that selenium is an important part of brain function
Oddly Brazil nuts give a good level of that, however too many (more then 3 it seems daily ) can cause an overload and create its own issues
I remember scoffing chocolate Brazil's as a kid by the handful .lol.

Health Benefits of Brazil Nuts
Brazil nuts: Learn about the nutrients in Brazil nuts and how they help improve thyroid health, heart health, blood sugar, and more.

But older sensible me thinks differently
I buy a bag each month and most days eat one or two
It causes me no discomfort & while it's another cost, a bag lasts a good while
And it Might do me good
I guess time will tell
And I'd rather try and waste my time
Then find out later it actually would have helped
Btw movies very much a mid afternoon matinee/murder she wrote not a Hollywood blockbuster stylee.
But I found it full of useful information.
And a true story to boot .
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