People with the “sweet tooth” gene variation of FGF21 tend to have less body fat than others, new research shows. That’s surprising because past research found that they have a particular sweet tooth and eat more sugar than others.

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People with the “sweet tooth” gene variation of FGF21 tend to have less body fat than others, new research shows. That’s surprising because past research found that they have a particular sweet tooth and eat more sugar than others.