The zingy fresh scent of a lemon may help elevate [COLOR=blue !important][COLOR=blue !important]your [COLOR=blue !important]mood[/COLOR][/COLOR][/COLOR]. Scientists have discovered a link between depression and our sense of smell: Citrus fragrances—lemons in particular—directly affect neurotransmitters in the brains of mice. The aromas help boost serotonin, a feel-good hormone, and reduce levels of norepinephrine, a stress hormone.