Being a little overweight reduces life expectancy, according to a new study of more than 30 million people from around the world.

The study, authored by Dagfinn Aune, a professor of epidemiology at Imperial College in London, serves as a rebuke to two other studies that have suggested that those who are slightly overweight have a lower mortality rate than those of average weight.

Aune told NBC News that he didn't buy the earlier studies.

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