If you've ever noticed that you feel more irritable, anxious, or mentally drained after days of poor eating, you’re not imagining it. What doesn’t help is thinking your mood is influenced only by your thoughts or circumstances.

If your mind feels foggy, your memory less sharp, or your mood more reactive than it used to be, you’re not imagining it. What doesn’t help is being told it’s just stress, age, or something you have to accept.