The tart scent of lime soothes the amygdala (the brain’s anxiety center), helping you feel calmer and less anxious within 2 minutes of the first bite (or sip) of a lime-infused dish or drink, report British researchers. An added perk: Limes contain a family of nutrients that help nourish and heal overworked adrenals, cutting stress levels by as much as 25 percent if you enjoy half a lime daily.