But back to the car analogy.
If we want our car to run optimally and reliably then the starting point is the makers recommendations and specifications. We don't have that for the human body BUT we can and should consider the human evolutionary process and make our understanding of that the starting point for optimal sun/bright light exposure, Vitamin D, magnesium, omega 3 ratio, melatonin levels.
Agreed and in addition not just the diet, but also the sleep wake circadian rythms, the seasonaly and weekly variation in eating habits.
I read a lot about the issues with Fructose restrictions and Candida etc and thought why doesn't this fit with my Paleo ideals, then realised it does, the issue isn't eating fruit, it is about daily consumption which promotes overgrowth scenarios, but our ancesters would have had seasonal variation and likely gone at least 3 months without significant fruit consumption, this would rest the gut, flush the yeasts and reset the candida clock every year.
So there would be other dietary factors that would also need to conform to the boom bust cycle for optimum gut health.
No harm in a feast, so long as we do touch on some famine (not extreme) as well, and on that note there is also an important aspect of the immune system which is only activated by significant hunger, cant remember exact detail, but obviously most of us have not exercised that part of us since birth.