Kids on Ozempic: Hidden Deficiency Spike

Nurse checks temperature of hospitalized boy — Photo: amedeoemaja / Shutterstock

Nearly one in six kids taking popular weight-loss and diabetes drugs developed a nutritional deficiency within a single year of starting treatment.

Story Snapshot

A large claims-data study of 2,031 kids ages 10-17 found 16.8% developed a nutritional deficiency within one year of starting GLP-1 drugs.
Vitamin D deficiency was the most common problem, showing up in 12.4% of these children.
Nutritional anemia and iron-deficiency anemia also appeared, affecting roughly 1.5% and 1.4% of young patients.
Only about 5% of kids got dietary counseling within the first 30 days of treatment, and just a quarter got it within six months.

What The Study Actually Found

Researchers pulled national insurance claims data from 2017 to 2022, tracking children who started GLP-1 drugs for weight loss, prediabetes, or type 2 diabetes. None of the kids had a prior deficiency diagnosis on record. Within a year, 16.8% picked one up anyway, according to the study published in Childhood Obesity. That number landed hard because it wasn’t a small pilot group. It came from thousands of real prescriptions and real follow-up visits.

Vitamin D led the list at 12.4%, but it wasn’t alone. Nutritional anemia showed up in 1.55% of children and iron-deficiency anemia in 1.44%. The study’s authors didn’t soften the message. They called nutritional deficiencies “a meaningful and underrecognized risk” for kids on these drugs. That’s a direct quote from the people who ran the numbers, not outside critics piling on.

Why Appetite Suppression Cuts Both Ways

GLP-1 drugs work by killing appetite. That’s the whole point for weight loss. But a child who eats less also takes in fewer vitamins and minerals, especially if meals were already imbalanced before treatment started. Dr. Contessa Metcalf explained that reduced food intake on these drugs can trigger fatigue, dry skin, hair thinning, brittle nails, muscle weakness, tingling, and brain fog. Those are not minor side effects for a growing child.

Here’s the part that should worry parents more than the deficiency numbers themselves. Most kids weren’t getting checked. Only 5% received dietary counseling in the first month of treatment, and only about a quarter got it within six months. A drug that suppresses appetite went out to children without a matching system to watch what they were eating. That’s not a drug failure. That’s a monitoring failure.

The Honest Limits Of This Study

This is observational claims research, not a controlled trial. It shows deficiencies appeared after kids started treatment, but it can’t prove the drugs caused every case. Claims data track diagnosis codes, not lab-confirmed vitamin D or iron panels for each child, and researchers can’t fully rule out baseline diet quality or undiagnosed deficits that existed before treatment began. The study also didn’t break results out by drug type, dose, or how long kids stayed on treatment.

There’s also a missing comparison. Kids with obesity or diabetes already run higher rates of vitamin D deficiency than their peers, with some pediatric studies putting baseline deficiency as high as 47% to 49% in children with excess weight. Without a matched group of similar kids who weren’t on GLP-1 drugs, it’s hard to know how much of that 16.8% reflects the medication versus the underlying condition it was prescribed to treat.

What Clinicians On Both Sides Actually Agree On

Nobody serious is arguing kids should avoid GLP-1 treatment altogether. Even the study’s own author framed the findings as a call for better care, not a call to pull the drugs. The goal, she said, is “proactive nutritional management when GLP-1s are prescribed to children, as opposed to waiting until a nutritional deficiency is diagnosed”. Clinical reviews echo that same message, describing these drugs as tools that need nutrition support built in, not medications to fear outright.

New #research from @LurieChildrens shows that nearly 1 in 6 #pediatric patients were diagnosed with a nutritional deficiency within the first year of treatment, underscoring the need for proactive nutritional management when GLP-1s are prescribed to kids. https://t.co/SznlqbZdpE pic.twitter.com/UvyfrDrAby

— Stanley Manne Children's Research Institute (@ManneResearch) September 23, 2026

That’s really the crux of this story. A powerful, effective treatment reached kids faster than the follow-up systems needed to keep them healthy while on it. Parents don’t need to panic over a headline number. They need to ask their child’s doctor a blunt question: who is tracking vitamin D, iron, and weight loss speed once this prescription starts? If the honest answer is nobody yet, that’s the real problem worth fixing.