I'm off to eat nothing but turnips for a year and get scurvy :-)
Certain groups like Europeans haven't, but humans have lived in lots of places that have year-round fresh fruit for quite a long time.
Still, they're much nicer than the old tomatoes. At least I'll die happy. There are too many humans in the world anyhow.
Which humans? There are many tropical regions where fruit is available year round.
I agree with the latter part, but what's wrong with health institutions recommendations? they look pretty sensible to me. I'm much more skeptical of advice from 'health gurus' that seem to have increasing influence.
The most important question by far is how to eat less, and the answer is very complex.
That's terrible advice. "Common sense" is what happens when popularly accepted ideas escape proper scientific scrutiny, and that's exactly how we wound up here.
Don't eat too much food. Limit processed foods. Eat lots of fruit and vegetables. Eat a large variety of foods. Be active.
These rudimentary guidelines are clearly difficult for a lot of people to follow, but I think it's pretty easy to avoid negative diet effects by just doing what most people intuitively know as the right thing, even if we consume some of all types of food. It seems to me this is more about self-control and effort level than any scientific knowledge, at this point.