For years, when patients asked me about weight gain, I’d deflect. “That’s not really my area. Talk to your doctor.” I was wrong. A study just came out that connects dots I’ve been trying to connect for decades: the bacteria in your mouth might be influencing your weight. Scientists at NYU Abu Dhabi collected saliva from 628 adults. They compared people with obesity to people at a healthy weight—matching them carefully by age, sex, lifestyle, and how well they brushed their teeth. Then they looked at the bacteria living in everyone’s mouths. Your mouth contains over 750 different...

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