I didn’t read all the linked articles, but the subhead “The wonders of modern medicine and nutrition…” caught my eye. Pretty sure the real wonders here are basic sanitation and antibiotics, and reduction in food-insufficiency. The McGovern committee’s original remit was to address the latter problem, and in the US they were at least substantially successful at that before they turned their attention to the dietary guidelines.
Post-dietary guidelines, it’s likely that nutrition policy is shortening lifespan with the diabetes epidemic. Just a little red meat (pun intended) for discussion…