Adolescent Bariatric Surgery: Rising Numbers, a Very Narrow Door

Professional guidelines endorse metabolic and bariatric surgery for adolescents with severe obesity. The newest American data on how often that endorsement is acted on make for uncomfortable reading: use of the operation in teenagers rose 7.7-fold over a decade, from 31 to 239 procedures per 100,000 eligible adolescents between 2016 and 2025 — and at its peak that still amounts to roughly one in four hundred of those who qualified.

The finding comes from a retrospective, population-based study published in the Journal of Pediatric Surgery on 4 September, drawing on Epic Cosmos, a federated electronic health record network. Its authors identified 5,430 US adolescents aged 12 to 19 who underwent surgery and modelled annual utilisation against the pool of adolescents meeting eligibility criteria. Utilisation climbed steeply with obesity severity: by 2025, adolescents with a BMI of 50 kg/m² or above had sleeves roughly nine times as often as those in the lowest eligible BMI class — 605 versus 69 per 100,000. Sleeve gastrectomy dominated at 89.1% of cases, and mean length of stay fell from 2.0 to 1.6 days.

Serious early harm was uncommon in that dataset. Within 30 days, surgical and infectious complications each affected no more than 0.6% of patients, and cardiovascular or thromboembolic events no more than 0.3%. Reoperation, conversion to gastric bypass and death were each recorded in under 0.4%. The diagnoses that did accumulate were the mundane ones: nausea and vomiting in 12.5% of patients by one year, and cholecystectomy in 7.5% by three years. The authors’ conclusion is a statement about delivery, not about surgery — given complication rates this low, they write, the task is to expand more equitable access.

A second country, a narrower band

Israel’s National Bariatric Surgery Registry, which is mandatory and captures every centre in the country, offers a check on the American picture from a health system with different referral economics. A retrospective analysis published in Obesity Surgery in August followed 460 adolescents under 18 who had primary surgery between 2017 and 2024. Mean age was 16.9 years and mean BMI 46.4 kg/m², with a female predominance; sleeve gastrectomy accounted for 87.6% of operations.

The comorbidity burden in that cohort was heavy. Steatotic liver disease was recorded in roughly 60% to 74% of patients depending on the measure, obstructive sleep apnoea in about half, and type 2 diabetes in about a fifth — conditions that in adults are the standard justification for operating. Sleeve gastrectomy produced mean excess weight loss of 56.3% at six months, 70.7% at two years and 68.5% at four, with sixteen patients later needing revisional surgery, mostly for recurrent weight gain.

The registry also documents the failure mode that recurs across adolescent bariatric care: dietitian visits fell from 47.6% of patients at one year to 14.5% at four. Weight-loss surgery is a lifelong commitment to follow-up, and adolescents are the group least able to keep it unaided.

The technique is shifting faster than the evidence

Where the American trend study shows what adolescents receive, a registry analysis in Surgery for Obesity and Related Diseases — the journal of the American Society for Metabolic and Bariatric Surgery — shows how they receive it. Researchers examined 21,746 patients aged 13 to 21 who had a minimally invasive sleeve between 2015 and 2024 in the MBSAQIP registry; 4,302 of those procedures were robotic. Robotic utilisation rose from 6.8% to 34.3% over the period.

On 30-day outcomes the two approaches were indistinguishable after adjustment for age, sex, BMI, comorbidities, smoking and year: adjusted odds ratios of 1.04 for infectious complications, 1.34 for pulmonary, 1.85 for thromboembolic events, 1.43 for surgical complications and 1.05 for overall complications, all with confidence intervals crossing one, and matching results from propensity-score and inverse-probability-weighted sensitivity analyses. Robotic operations took 21.2 minutes longer. The authors are explicit that low event rates limited their power for rare outcomes, and that cost and longer-term questions remain open — the honest reading is short-term equivalence, not superiority.

Teenagers against young adults, matched

The comparison adolescent surgeons are asked about most often is whether operating at 15 does anything that waiting until 20 would not. A propensity-matched cohort study in Obesity Pillars used the TriNetX US collaborative network — federated records from 66 health systems and roughly 113 million patients — to pair 318 adolescents aged 13 to 17 with an equal number of young adults aged 18 to 21 on 25 pre-surgical characteristics, deliberately including GLP-1 receptor agonist prescriptions.

At one year, postoperative BMI was statistically equivalent: 38.6 versus 39.1 kg/m². There were no significant differences in persistent type 2 diabetes, persistent hypertension, dyslipidaemia, steatotic liver disease or new-onset reflux, and no reoperations or conversions in either group. One detail stands out as a sign of the times: before matching, 29.4% of adolescents had been on semaglutide compared with 14.6% of young adults, which is why the authors balanced for it. Pre-existing vitamin D insufficiency affected about 49% of both groups. This is retrospective electronic-record data with propensity matching, which balances only what has been measured.

What the long horizon already shows

None of those four papers reaches the timescale that matters for a teenager, and here the field is anchored by an NIDDK-funded dataset rather than by any single centre. Teen-LABS — the adolescent arm of the longitudinal assessment built alongside the adult LABS cohort — followed teenagers for a decade, and its published comparisons are instructive. Five years after gastric bypass, adolescents had lost 26% of body weight against 29% in adults from the LABS study who had the same operation later in life.

The metabolic dividends diverged more sharply than the weight. After surgery, no teenagers with type 2 diabetes needed diabetes medication, compared with 26% of adults; 11% of teenagers still needed blood-pressure medication compared with 33% of adults. The price was also visible: adolescents were more likely than adults to need a further abdominal operation, most often gallbladder removal, and more likely to run low on iron and vitamin D. Death rates were similar. At ten years, participants averaged a 20% reduction in BMI and a 55% reduction in type 2 diabetes, against 18% at seven years and 12.7% at twelve years in the adult data. Teen-LABS is a prospective observational cohort funded by NIDDK; this site is an independent archive that reports on that work and is not affiliated with the institute.

Two things follow from reading these datasets together. The first is that the adult picture we described in our earlier review of US bariatric surgery volume trends — an adult volume that peaked in 2022 and then fell — has an adolescent analogue in miniature: rising percentage growth from a very low base, concentrated in the heaviest adolescents, with sleeve gastrectomy as the near-universal operation. Eligibility in BMI terms, the terrain our BMI calculator addresses, is doing a great deal of the sorting.

The second is that the research question has moved. The evidence that adolescents can lose substantial weight and shed diabetes and blood-pressure medications is no longer seriously contested; what remains open is retention, cost, robotics, and the fact that a treatment endorsed for eligible teenagers reaches fewer than one in four hundred of them. The LABS study archive on this site documents how the adult cohort was designed to answer durability questions with prospective measurement — the adolescent field would benefit from the same discipline applied to access.