Every couple has done it. "I'll have what you're having." It feels like an ordinary decision. One shared dinner becomes a weekly routine. Then the same grocery list. The same takeaway order. Before long, you're eating many of the same foods without giving it a second thought. That's what happens when two lives become one. But scientists are beginning to ask an intriguing question: If couples gradually start eating the same foods, could they also be shaping their gut microbiomes in similar ways? More Than a Shared Plate We often think of eating as a personal choice. In reality, it's one of the habits we share most. Partners influence what food comes into the house, what gets cooked for dinner and what ends up on each other's plates. Over time, these small, everyday decisions can make couples' diets surprisingly similar, a pattern that has been observed in research on spouses and social eating behaviours. Most of us stop thinking about it there. Scie...