A large bariatric surgery study challenges a common barrier to care
Patients with extreme obesity make up a larger share of bariatric surgery cases than many clinicians and health systems may assume, and their size alone should not be treated as a reason to deny treatment, according to a new study led by researchers at LSU’s Pennington Biomedical Research Center.
The study analyzed 1,262,454 metabolic and bariatric surgery patients from 2015 through 2023 and found that 5.3% had extreme obesity, defined as a body mass index of 60 kilograms per square meter or higher. Patients with a BMI of 70 or higher accounted for about 1.1% of surgeries each year, and that share remained relatively stable across the nine-year study window.
Those numbers do more than add a new statistic to the obesity literature. They sharpen the picture of a medically complex population that researchers say has long been underrepresented in both clinical care and research. In practical terms, the findings argue against a quiet but consequential form of exclusion: assuming the highest-BMI patients are too risky, too unusual, or too difficult for surgery pathways designed around less severe cases.
What the study found
According to the report, patients with extreme obesity face a greater burden of several health conditions and surgical complications than other bariatric surgery patients. But the broader conclusion is not that surgery should be avoided. It is that overall surgical risk remains relatively low even in this group, and that treatment decisions should reflect that reality.
The researchers described the work as one of the most detailed clinical characterizations to date of bariatric surgery patients with extreme obesity. That matters because this subgroup, while numerically smaller than the broader obesity population, is growing fast in the United States. The study notes that more than 1.2 million Americans now have a BMI of 60 or higher.
Lead author Dr. Vance Albaugh characterized extreme obesity as one of the most medically complex and understudied forms of obesity and said the population has been overlooked for decades. The study’s framing is therefore both clinical and structural: these patients face substantial health risks, but they also face barriers to care that may not be justified by the operative risk profile alone.
Why this question matters
Bariatric surgery is already used in patients with serious obesity-related disease, but the threshold question of who gets referred, evaluated, and accepted for treatment remains uneven. For patients at the highest end of the BMI spectrum, assumptions about anesthesia difficulty, perioperative risk, equipment limitations, and postoperative complications can shape access long before a surgeon makes a final recommendation.
The new findings do not claim that surgery is simple for this group. They indicate the opposite: comorbidity burden is higher, and complications are more common than in lower-BMI bariatric patients. But the key distinction is between higher risk and prohibitive risk. The study supports the view that these are not the same thing.
That distinction has implications across the care pathway. Referring physicians may need to reconsider whether they are delaying surgical evaluation too long. Hospitals may need to assess whether infrastructure gaps, rather than medical contraindications, are keeping patients out. Insurers and policymakers may also face pressure to align coverage and treatment standards with evidence from larger datasets rather than older assumptions about operability.
A population that has been visible but poorly described
One reason the study stands out is sheer scale. By analyzing more than 1.26 million patients over nearly a decade, the researchers were able to show that extreme obesity is not a fringe category appearing only sporadically in bariatric practice. It is a consistent part of the case mix.
That consistency matters because it suggests health systems should design for these patients rather than treating them as exceptions. If about one in nineteen bariatric surgery patients has a BMI of at least 60, then specialized protocols, equipment, staffing expectations, and follow-up planning are not edge-case investments. They are part of routine preparedness.
The study also helps fill a data gap around the highest BMI tiers. Patients with a BMI above 70 are often discussed in abstract terms because datasets thin out at that level. Here, the authors report that roughly 1.1% of surgeries annually involved patients in that range, providing a clearer sense of how often clinicians are already operating in this territory.
What should change next
The most immediate takeaway is not that every patient with extreme obesity should undergo surgery. It is that extreme obesity by itself should not preclude treatment. That is a more disciplined and evidence-based position than either automatic approval or automatic exclusion.
For clinicians, the study supports individualized risk assessment instead of blanket reluctance. For health systems, it underscores the need to invest in facilities and pathways capable of serving this population safely. For patients, it offers a clearer message that the most severe obesity categories are not outside the bounds of surgical care simply because they are difficult to manage.
The study appeared in the journal Obesity under the title “Extreme Obesity (BMI ≥60 kg/m2) Characterization Up to and Beyond 80 kg/m2 in 1,262,454 Bariatric Surgery Patients.” Its core contribution is straightforward: it quantifies a growing patient group, shows that these cases are already a meaningful part of bariatric practice, and argues that the presence of added complexity should drive better preparation rather than reflexive exclusion.
That is an important shift. In obesity medicine, the patients with the greatest disease burden are often the ones most vulnerable to delayed or fragmented care. Evidence that their overall surgical risk remains relatively low, even alongside increased complications and comorbidities, strengthens the case for treating access as a solvable care-delivery problem rather than an unavoidable medical dead end.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com