What used to be a whisper— I’m on Ozempic —has recently become a shout. Celebrities like Serena Williams, Oprah, and Kelly Clarkson are on the jab—a.k.a. an injectionable medication like Ozempic, Zepbound, or Mounjaro, which are synthetic versions of the GLP-1 hormone our body produces—and the results typically include weight loss.

“GLP-1 is short for glucagon-like peptide-1, a hormone that we produce in our gut after we eat,” says Rocio Salas-Whalen, a board-certified physician who specializes in obesity medicine and endocrinology. Some 90% of Dr. Salas-Whalen’s patients are currently on a form of the medication, and it inspired her to write the book Weightless , due out in December. “The main function of this hormone is to regulate glucose, but it also helps us feel full after w

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