Internet 1, Science 0. Smaller Brussels sprouts are sweeter; I say phooey! Several sources claim smaller Brussels sprouts are sweeter, but I couldn’t find any actual science or data to back that up, and trust me, I tried.  There are less than two grams (~1.7gms) of natural sugar in 100gms raw Brussels sprouts; cooked 100gms has 2.2gms of sugar, with zero distinction on the size or “ripeness” of Brussels sprouts. I’m going to stop there because I could ask if size or maturity influences sugar content, but again, big fat zero for information on that topic.