Another thing with fruit is that the current fruit we eat has been modified to be MUCH sweeter than it used to be. Sometimes apples taste sweeter than candy to me. And yes, everything is super sized. A third issue is that fruit, and the sugar it contains, is now available year-round in unlimited quantities. And we don't have to expend any energy whatsoever to acquire it. I was born in a small village surrounded by fruit orchards, but everything had it's season, you shared the available fruit with the rest of the village, and you had to do some serious physical work to procure the fruit. Same with honey. You had to actually figure out how to get it!
And the lack of physical activity means that the sugar has nowhere to go. When I've done low-carb before, I've been able to reintroduce fruits once my physical activity warrants it. And then it's fine in moderation. My system is very sensitive in general, I react strongly to coffee, alcohol, carbs, meds, stress, etc.... Dh can have plenty of carbs and sugar without any ill effects but I suspect he will have a day of reckoning.