One symptom of my pms/pmdd (project: find better language for it) is inability to focus. I experienced this a lot and blamed myself for it (laziness, lack of discipline) before noticing that it corresponds to my monthly cycle. I become extra-distractable. I skip between activities on my devices, between reading a book and writing a blog and reading social media and writing a note and doing research and shopping online and writing a thought and looking for a recipe, etc. My attention spins out-of-control, which is frustrating and disorienting and compounds other symptoms like despair and self-loathing. But if I munch on a snack, then I can possibly focus on light reading. I like sweet but not sugary snacks with carbs, like healthfood cookies or fried bananas. Even if the snack doesn’t help me concentrate, it can help me take a nap.