"What is the book that changed your life? (not novels or religious texts)"
I think it's a wonderful way to connect in a less superficial way and learn a little more about each other. It's also a wonderful way to discover new books worth reading.
This is one of them (the full list is here):
A cheeky up-close and personal guide to the secrets and science of our digestive system
For too long, the gut has been the body's most ignored and least appreciated organ, but it turns out that it's responsible for more than just dirty work: our gut is at the core of who we are. Gut: The Inside Story of our Body's Most Underrated Organ gives the alimentary canal its long-overdue moment in the spotlight. With quirky charm, rising science star Giulia Enders explains the gut's magic, answering questions like: Why does acid reflux happen? What's really up with gluten and lactose intolerance? How does the gut affect obesity and mood? Communication between the gut and the brain is one of the fastest-growing areas of medical research--on par with stem-cell research. Our gut reactions, we learn, are intimately connected with our physical and mental well-being. Aided with cheerful illustrations by Enders's sister Jill, this beguiling manifesto will make you finally listen to those butterflies in your stomach: they're trying to tell you something important.