Nutrition research usually has a structural problem: people who eat less sugar also tend to exercise more, drink less, earn more, and see doctors more often. Untangling sugar from everything else is nearly impossible.
A study published July 29 in Neurology got around that problem using a historical accident. Britain rationed sugar from wartime until September 1953. When rationing ended, average adult intake nearly doubled almost overnight, from roughly 41 grams a day to about 80 grams, while consumption of other major foods stayed largely stable.
