According to Google's scraping of the USADA data, 40% of the calories in human breast milk are from sugar. That alone makes me question if sugar is really terrible for brain development in children.
I want recommendations of "don't eat sugar" to dig into the details, because sugar is everywhere. My mother-in-law "doesn't eat sugar" but constantly snacks on figs/dates, pours honey over everything, and drinks fruit smoothies daily. In my opinion, she has a very high sugar diet despite not adding any table sugar or corn syrup to anything. Many recommendations say to limit "added sugar" without explaining why naturally occurring sugar is okay.
What's a nice fruit that's not bred to be way too sugary?