The endothelial function can be preserved for all your life as long as you
do not have arterial and heart congenital problems.
You did mention some things to bolster the endothelial function, but the
most important thing is to prevent the deterioration of it due to a
defective vascular growth factor gene.
The only real thing so far is to engage in a genetic treatment clinical trial
as early in your life as possible (best before 10 yrs, which is usually long
before you get any symptoms like "anxiety" and others) to try correcting the congenital vascular abnormalities before endothelial dysfunction advances.
Therefore, as long as there is no widespread vascular and heart testing
in the children, and I do not mean only in the wealthiest countries
such as usa, uk and others, there will always be medical tragedies
later on.
The thing with psychiatry is that it uses biased and superficial public
labelings (eg. Mentally disabled, etc) on people that are suffering much
more than mentally. It virtually breaks the empathy of the more fortunate
towards the less fortunate (eg. People committed into psychiatric yards)
by and with the secrecy and power of this profession.
You can say whatever you want, but hiding the suffering does not
diminish it!
This is why I am pleading for a merge of the psychiatry into the
palliative care where the human dignity is still being preserved.
Of course, in order to preserve the status of psychiatry, there are
people whose problems are ignored although they might still get a
chance if everything would have more transparency and treated in
time. Until then, these people (or the people from the poorer countries
in the future) will be medical casualties.