Actually here's a theory about this:
I'd seen that meme, or variations of it, but the list of symptoms doesn't really match what I've found from I consider more reliable sources of medical information than reddit:
Find out about the main symptoms of frontotemporal dementia and when to get medical advice.
www.nhs.uk
www.mayoclinic.org
Learn about symptoms, diagnosis, causes, risks and treatments and key differences between FTD and Alzheimer's.
www.alz.org
They list several possible symptoms, some of which Trump exhibits and some of which he doesn't, but I haven't been able to find that distinctive forward-leaning posture listed anywhere as an indicator.
In recent years, there has been increasing questioning of the fitness of senior politicians to hold office on the basis that they have dementia or are otherwise mentally or physically unwell. It’s particularly prevalent across social media.
www.alzheimers.org.uk
This gives as one of the reasons for not diagnosing at a distance,
It's one thing to dislike the things the President says or does, but to attribute Trump’s behaviours to dementia is both hurtful and unhelpful.
This language reinforces the myth that people with dementia are 'crazy' or incapable of making sound decisions.
It also supports the idea that people living with dementia are unfit for work, which may not be the case.
We want a society in which people with dementia feel understood, valued and able to contribute to their community. But to get there we need to stop making assumptions and recognise the many people living well with dementia.
So, all in all, I'm a bit dubious -- he's clearly not well, but I'm certainly not qualified to diagnose him.
ETA: I rather like the Alzheimer's Society's explanation that Alzheimer's isn't enough to cause Trump's erratic behaviour, lack of judgement and general incompetence. Which, come to think of it, we've seen demonstrated -- towards the end of his second term, Reagan was clearly not well, but was much more able to act as President than Trump has ever been.
