Gary Fetke (orthopedic surgeion who is the spouse in the piece) is a pioneer but got punnished in Australia for daring to reverse his type 2 orthopaedic patients' diabetes via LCHF.
There is a quite a lot of interviews on YouTube on the topic of this blog.
To be balanced, it was found that 7th Day Adventists lived longer and healthier than other gorups but this in itself did not prove that avoiding dairy and meat was the cause. The con founders were aovidance of alcohol and their religiousity (strong community ethic) and avoidance of tobacco. Other religious groups in the US who do allow meat achieved similar results.
If we think about what we have in common with the plant based advocates it is quite a lotas Zoe Harcombe (a reformed vegetarian) points out she'd largely agree with Michael Pollan's guidance to 'Eat (real) food, mainly plants, not too much' by simply substituting in 'mainly meat'. Both camps are avoiding processed foods and sugar and I believe that's where the Public Health focus should be and not in the weeds of vegan v. keto.