What astonishes me is that diet is one thing - and THE most important thing - that has been looked at more or less scientifically for 2,500 years. It was virtually the only tool the ancients had for medical treatments and evaluations. And they did look at diet carefully. It was something they could observe, measure, record. And medical people did so throughout recorded history. And they WERE scientists. They didn't have all the instruments we have (and we have many fewer than we will have in the future), but they knew how to observe and analyze.
And still they couldn't get diet figured out. Nor can we moderns. Carbs vs. fats, round 827, anyone? The most recent findings show no great difference:
https://www.washingtonpost.com/life...arch-says-it-doesnt-really-matter/2017/07/13/ Sugar? The new villain? To the point that it has to be treated as poison? I have my doubts about that extreme treatment.
I find it kind of comforting that nobody really knows! There can't really be diet police, not yet, thankfully. I like the idea that we don't really know that much more than the Greeks. We have to ask ourselves what makes sense for us. Cutting a food group out? Cutting a meal out? Cutting hours where we consume food? Counting calories? Listening to our own fullness cues? Ditching restaurants and take-out?
There are a variety of approaches depending on one's own sense of what works.