Wikipedia defines common sense as “knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument”
Try to avoid using this topic to express niche or unpopular opinions (they’re a dime a dozen) but instead consider provable intuitive facts.
no, it’s not. it’s a meta analysis of multiple double blind studies. multiple
if you did the same with cyanide you would be able to conclude that “taking cyanide and being dead is positively correlated” even if there were other causes of death. in this wide summary of multiple double blind experiements, there is no correlation between sugar intake and child behaviour. that’s not to say kids don’t act up and get hyper, but it’s other causes, most signficantly parents just underestimate how hard kids find it to regulate themselves when having treats of any sort (non-sugar included) or being in a party atmosphere with friends.