Perhaps relevant to older folks needing more protein...
Part of aging for some people is the loss of lean muscle mass (sarcopenia), to the point of becoming very thin and frail. Often associated with a loss of appetite. Conventional wisdom is to up the protein eaten by these people, e.g. adding protein powders or shakes to their diet to boost calories some and protein a LOT. And that does appear to help people.
It appears that a subset of older people have degraded kidney function (often a result of atherosclerosis of the blood supply to the kidneys and vessels within) which results in mild acidosis (acidification of the blood). Apparently sarcopenia is largely caused by acidosis, and can also be reversed by treating the acidosis directly. The Western diet tends to be acidic, which likd the high salt, we can cope with through our kidneys. But as our kidneys age (or are clogged up with cholesterol) our ability to excrete acid (and salt) decreases so we get acidosis and muscle wasting (and hypertension from the salt).
There are folks that spend a lot of time peeing on litmus paper... I am not one of them (yet).
So what we see as 'normal aging' in the west is probably related to the Western diet + cumulative kidney damage, with the latter making the effects of the former more apparent later in life.
WFPB diets are alkalizing. So definitely up the protein, but soy based powders and bean/lentils would seem sufficient for this, and cheaper than beef.
Meat and dairy are pro-inflammation and carcinogenic, probably not a good idea to increase if you are older.
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IN other news, I read about a neurotoxin called BMAA from cyanobacteria that has been implicated in major neurodegenerative diseases:
An important new article on ALS epidemiology strongly supports the hypothesis that the cyanobacterial toxin BMAA causes ALS, a devastating paralytic disease that can strike people down in the prime of life.
brainchemistrylabs.org
In the US, it is mostly eaten in shellfish, and seafood from warmer water. Apparently the BMAA (which is an abnormal amino acid) gets incorporated into brain proteins over time, and then late in life drives/accelerates the protein misfolding in ALS, Alzheimers and perhaps Parkinsons. The 'latency time' from ingestion to brain problems is 30-50 years. Apparently there are ALS clusters in New England where people lived near an algae laden pond, and ate fish from the pond for many years.
My Mom just passed last year (at age 87) with Stage II dementia, after a life time of eating lots of shellfish, for the last 25 years from the warm waters of Florida.