It helps that we’re right. That it can’t be bad to eat what humans have eaten for 2 million years.
But 2 recent things I’ve looked at were studies done a few decades ago and shelved because they didn’t get the “right” answer, but were recovered recently and published showing the lipid hypothesis was wrong and the cause of metabolic disorder was carbohydrates
They were suppressed in the 70s and 80s, now they are published. Dietary guidelines in Australia (one of the biggest wheat exporters) now allow low carb for treating type 2 diabetes.
I do believe we’re watching a change in consensus (which as always is progressing one death at a time - perhaps it’s good that the other side is committed to a metabolically dangerous path)
As far as I can tell low carb is fully accepted in psychiatric treatment, fairly accepted in diabetics, proven in weight loss but not widely prescribed, and nearly never used by for profit weight loss organisations because it’s so easy to DIY without any special products
Researchers have also noticed that they can get a thousand zero carb eaters from Reddit with high adherence to animal sourced food only, and likewise vegans and vegetarians since we separate ourselves so well, so some good epidemiological research is possible where you can actually compare some hundreds of people who eat only meat to others who eat only plants
It would probably be fairly straightforward to compare the spectrum from vegan through vegetarian, pescatarian, SAD, keto, ketovore, carnivore and all the shades of grey I missed though we’re probably unique in our ability to say exactly what we ate every day for years
I think that is optimistic, I don’t think lchf is embraced anywhere outside of niche research and novel practitioners. The change is happening, but it’s really slow.