My friend Sara, eight weeks after giving birth, left me a tearful voicemail. I’m a clinical psychologist specializing in postpartum depression and psychosis, but mental health wasn’t Sara’s issue. Postpartum weight gain was.

Sara told me she needed help. She’d gained 40 pounds during her pregnancy, and she was still 25 pounds overweight. “I’m going back to work and I can’t look like this,” she said. “I need to take Ozempic or something. But do you know if it’s safe?”

Great question. Unfortunately researchers don’t yet have an answer. On Dec. 1, the World Health Organization released its first guidelines on the use of GLP-1 receptor agonists such as Ozempic, generically known as semaglutide. One of the notable policy suggestions in that report is to not prescribe GLP-1s to pregnant women. Disappointingly, the report says nothing about the use of the drug by postpartum women, including those who are breastfeeding.

There was a recent Danish study that led to medical guidelines against prescribing to patients who are pregnant or breastfeeding.

None of that is what my friend wanted to hear. I could only encourage her to speak to her own medical doctor.

Sara’s not alone. I’ve seen a trend emerging in my practice in which women use GLP-1s to shed postpartum weight. The warp speed “bounce-back” ideal of body shapes for new mothers has reemerged, despite the mental health field’s advocacy to abolish the archaic pressure of martyrdom in motherhood. GLP-1s are being sold and distributed by compound pharmacies like candy. And judging by their popularity, nothing tastes sweeter than skinny feels.

New motherhood can be a stressful time for bodies and minds, but nature has also set us up for incredible growth at that moment. Contrary to the myth of spaced-out “mommy brains,” new neuroplasticity research shows that maternal brains are rewired for immense creativity and problem solving.

How could GLP-1s affect that dynamic? We just don’t know. We do know that these drugs are associated with changes far beyond weight loss, potentially including psychiatric effects such as combating addiction.

Aside from physical effects, this points to an important unanswered research question: What effects, if any, do GLP-1s have on a woman’s brain as it is rewiring to attune to and take care of a newborn? And on a breastfeeding infant? If GLP-1s work on the pleasure center of the brain and your brain is rewiring to feel immense pleasure from a baby coo, I can’t help but wonder if that will be dampened. When a new mom wants a prescription for a GLP-1 to help shed baby weight, her medical provider should emphasize those unknowns.

These drugs may someday be a useful tool for new mothers. GLP-1s are helping many people with conditions other than obesity. A colleague of mine was born with high blood pressure and cholesterol. She exercised every day and adopted a pescatarian diet. Nothing budged until she added a GLP-1 to her regimen, bringing her blood pressure to a healthy 120/80 and getting cholesterol under control. My brother, an otherwise healthy young man recently diagnosed with a rare idiopathic lymphedema of his left leg, is considering GLP-1s to address inflammation and could be given another chance at improving his quality of life.

I hope that GLP-1s will continue to help those who need it. And I urge everyone — especially new moms — to proceed with caution. A healthy appetite for nutritious food is natural. That food fuels us for walks with our dogs, swims along a coastline, climbs through leafy woods. It models health and balance for the young ones who are watching us for clues about how to live a healthy life.

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Nicole Amoyal Pensak, a clinical psychologist and researcher, is the author of “Rattled: How to Calm New Mom Anxiety With the Power of the Postpartum Brain.”

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