The Bone You Have At 50 Was Built Before You Turned 18

You might think bone density is something you build slowly over a lifetime, but nearly all of your peak bone mass is set before age 18, in a four-year window most parents never see coming. In this solo episode I break down what happens to a child's skeleton during that window, what GLP-1 medications do inside a body that's still growing, and the protocol I'd want every parent to follow. Muscle and bone are not what a body has they're what a body was built to become.

In this solo episode, Dr. Gabrielle Lyon breaks down the science of bone health in children, adolescent GLP-1 use, and muscle building in kids:

Why the four years around age 12 in girls and 14 in boys account for close to 40% of the total bone mineral a person will carry for lifeWhy a hip fracture in a healthy 29-year-old is almost always a story about a childhood building phase that never happened, often tied to a history of restriction like anorexiaWhat semaglutide and other GLP-1 medications do inside a still growing skeleton, and why no long term bone density data exists for adolescents on these drugsWhy a JAMA Network Open trial found the group combining liraglutide with resistance training lost the most weight with bone mineral density statistically unchanged, while the drug alone caused bone lossThe complete protocol for parents: track strength and function over the scale, muscle strengthening and bone loading exercise three days a week each, protein at breakfast, and a screen time floor instead of a ceiling

Muscle and bone are not what a body has; they are what a body was built to become, and childhood is the only window that bone accrual and muscle development happen. Understanding pediatric bone health, sarcopenia in children, and the real research on GLP-1s and adolescents is the difference between guessing with your child's skeleton and protecting it on purpose.

Study and References:

Sarcopenic Obesity in Children - https://pubmed.ncbi.nlm.nih.gov/41995008/Sedentary Behaviors in Today's Youth (AHA) - https://www.ahajournals.org/doi/10.1161/CIR.0000000000000591Semaglutide and Body Composition (STEP 1) - https://pmc.ncbi.nlm.nih.gov/articles/PMC8089287/Peak Bone Mass Position Statement (NOF) - https://pubmed.ncbi.nlm.nih.gov/26856587/Bone Health After Exercise vs GLP-1 Treatment - https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2820308Resistance Training in Kids: An Umbrella Review - https://pubmed.ncbi.nlm.nih.gov/32757164/

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