Since World War II, Sister André has lived a life of service as a nun, caring for orphans, the elderly, and the sick. Because of her communal lifestyle, she developed the habit of always eating with others. Though it may seem trivial, she insists it’s one of her keys to long life.

“When you eat together, you talk, laugh, and relieve stress. It keeps your mind relaxed and helps you bond with others. Eating with people also gives your brain time to recognize when you’re full, which prevents overeating and helps control weight,” Sister André explained.

Research from Oxford University (USA) supports this view: people who eat meals with others tend to feel happier and less lonely. A better mood strengthens the immune system—and a stronger immune system can lead to a longer life.