Oatmeal. Carbs help you produce serotonin, a calming hormone that helps fight anxiety’s negative effects—which is probably why many of us crave them when we’re stressed. Go with the craving, but choose healthy sources. Oatmeal is high in fiber, which means that your body will absorb it slowly. In one fell swoop, you’ll prolong the serotonin boost, keeping yourself feeling full for longer, and on less, while controlling your blood sugar.