A study of nearly 65,000 people born around Britain's wartime sugar rationing has found that those who consumed less sugar before birth and in their earliest years developed dementia at rates 21 to 23 percent lower than those born into an era of abundance. The research, published in Neurology, draws on a rare natural experiment — the abrupt end of rationing in 1953 — to suggest that what enters the body in its most formative moments may quietly determine the shape of the mind in its final decades. Brain imaging lends the finding biological weight, revealing more gray matter and less microscopi