Think of it this way: the gut community in obese mice is like a fuel-efficient car, extracting more energy from food and passing more along to its host than its gas-guzzler counterpart in lean mice.

• 可以这样想象：肥胖老鼠的肠道菌落就像一辆高效燃油小轿车，与瘦弱老鼠菌群大量消耗汽油相比，它从食物中获得更多的能量并供给宿主。