Older women who confined their daily eating to a shorter window improved more on certain cognitive tests over six months than women who ate across a longer window, according to a pilot trial presented at a nutrition conference in late July. This was a pilot study of 47 participants, presented as a conference abstract, and it has not been peer reviewed or published. A pilot study is designed to test whether a larger trial is feasible and to generate hypotheses. Notably, the more a participant shortened her eating window, the larger her gains on both measures. Why a Pilot Study Cannot Carry This ConclusionForty-seven participants split into two groups produces small numbers in each arm.