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)
The flaw in your logic is that nature’s only purpose is reproduction. As long as you make it at least that far, nothing else matters. Reproduction starts relatively early in our lifetime.
Thats a interesting point, reproductive success also encompass strategies where the longevity of the parent gives better chances to the offspring as well.
Only to a point. Even if you include raising kids, that’s only roughly halfway into our lifetime though.