Intimate kissing leads to 80 million bacteria being exchanged within 10 seconds. We all have our unique bacterial signal. The interest in our microbiome is rising - treating bowel disorders, skin healing for example. And does it influence whether we are lean or fat? Or anxious? I have come across Prof Tim Spector's book which seems to have been endorsed by some weil kent faces - including Nigella Lawson (no relation), Dr Mark Porter and Dr Michael Mosely. And should we be interested? Clue: Eat a diverse diet from natural ingredients. Try probiotics if you like (some say not if on cancer therapy), avoid unnecessary antibiotics and skin disinfectants.
Why not take a look at the article and make your own mind up.