Doctors Share How to Protect Bones While on GLP-1s

Millions of people are taking GLP-1 medications for weight loss, and a recent study linking these drugs to bone problems sparked worry across social media. But doctors say the headlines missed the most important part of the story.

A study presented at a major medical conference found higher rates of bone conditions among people taking GLP-1s. The catch? It hasn't been peer reviewed, didn't prove the drugs caused the problems, and left out crucial factors like exercise habits and nutrition.

"While well-conducted observational studies can reveal a potential relationship between a medication and a clinical outcome, they cannot determine whether a medication directly causes that clinical outcome," said Dr. Marci Laudenslager, an obesity medicine physician at Johns Hopkins.

The real culprit isn't the medication itself. It's rapid weight loss, no matter how you lose the weight.

When you carry less weight, your skeleton bears less load. Bones respond to that reduced pressure by slowing down formation. This happens with any major weight loss, whether through lifestyle changes, surgery, or medication.

Exercise physiologist Kelyssa Hall explains it simply: "Bone formation or strengthening is improved with load to the skeletal system, so losing weight decreases the regular load on the bones overall."

The good news? You can protect your bones throughout your weight loss journey.

Strength training tops the list. Resistance exercise improves bone density and helps prevent muscle loss. Hall recommends starting with two to three sessions weekly, with recovery days in between.

Protein matters too. Most adults need about 0.36 grams per pound of body weight daily. Older adults and postmenopausal women may benefit from slightly more.

Slowing down your weight loss also helps. Aiming for five to ten percent of your body weight over six months gives your bones time to adapt. That's roughly half a pound to two pounds weekly.

Make sure you're eating enough overall. The appetite suppression from GLP-1s sometimes leads people to under-eat dramatically. "Hunger is an essential hormonal cue we all need in order to sustain health," Dr. Laudenslager said.

The Bright Side

Bone loss doesn't happen overnight. That gives you plenty of time to take preventive action and catch any issues early through regular checkups.

Dr. Laudenslager points out that "there are a wealth of opportunities throughout a person's weight loss journey to prevent and treat bone loss early on if it's detected through surveillance."

If you have concerns about bone health while taking a GLP-1, talk to your doctor. Board-certified obesity medicine physicians specialize in this kind of nuanced care. The American Board of Obesity Medicine and Obesity Action Coalition both maintain directories to help you find one.

The takeaway isn't to fear these medications but to support your body smartly while you lose weight. With the right approach, you can reach your health goals while keeping your bones strong.