We’re used to seeing Serena Williams on our TVs, muscles flexing, smashing a tennis ball past her opponent. But in a recent 30-second commercial, Williams traded the racket for a GLP-1 drug injector pen.  Williams, whose most recent child was born in 2023, has become a spokeswoman in her post-retirement days for Ro, one of the many boutique health care firms to get in on the GLP-1 craze. “They say GLP-1s for weight loss is a shortcut — it’s not. It’s science,” she says during the spot. “After kids, it’s the medicine my body needed.” Key takeaways • Patients should be eating a pr...

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