First of all, research shows 95% of women admit they’ve withheld information from loved ones AND lied to someone close to them. But even the lies we consider harmless – like, ‘Yes, I love your meatloaf!’ – can cause anxiety and body aches… especially if you feel guilty about lying. Dr. Deirdre Fitzgerald is a professor of behavior analysis at the Chicago School of Professional Psychology. And she says, even lies to save face – or save someone else from embarrassment – can weaken the immune system, causing headaches, back pain, and yes, diarrhea.

Follow me on Facebook