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Definitions and prevalence of dietary patterns:

Seventh-day Adventists have a lower risk than other Americans of certain diseases, and many researchers hypothesize that this is due to dietary and other lifestyle habits. We know this thanks to the previous Adventist Health Studies. 1

These studies showed the advantage of a vegetarian and vegan diet among Adventists, found strong evidence that meat increased risk of colon cancer and coronary heart disease, and that nut consumption reduced risk of coronary heart disease. Other significant associations between cancers and other foods have also been reported. [2]

Seventh-day Adventists have a lower risk than other Americans of certain diseases, and many researchers hypothesize that this is due to dietary and other lifestyle habits. We know this thanks to the previous Adventist Health Studies. (1)

These studies showed the advantage of a vegetarian and vegan diet among Adventists, found strong evidence that meat increased risk of colon cancer and coronary heart disease, and that nut consumption reduced risk of coronary heart disease. Other significant associations between cancers and other foods have also been reported. (2)

Seventh-day Adventists have a lower risk than other Americans of certain diseases, and many researchers hypothesize that this is due to dietary and other lifestyle habits. We know this thanks to the previous Adventist Health Studies. [1]

[1] https://en.wikipedia.org/wiki/Adventist_Health_Studies#
[2] https://academic.oup.com/ajcn/article/100/suppl_1/353S/4576455?login=false

Seventh-day Adventists have a lower risk than other Americans of certain diseases, and many researchers hypothesize that this is due to dietary and other lifestyle habits. We know this thanks to the previous Adventist Health Studies. 1

(1) https://en.wikipedia.org/wiki/Adventist_Health_Studies#
(2) https://academic.oup.com/ajcn/article/100/suppl_1/353S/4576455?login=false

That's the closest i've got at the moment.
You might want to look at the study/studies (?) Dr Neal Barnard mentions that led him to use a plant based diet to reverse type 2 diabetes but I doubt they'd meet your criteria.