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A new analysis of national health data reveals a dramatic and disproportionate rise in the most severe forms of obesity among adults in the United States over the past two decades. While the overall adult obesity rate has climbed by about 30 percent since 2001, the prevalence of individuals with a body mass index (BMI) exceeding 60 kg/m² has soared by an unprecedented 210 percent, according to research published in The Lancet: Diabetes & Endocrinology by a team from Pennington Biomedical.
Extreme Obesity: A Growing Public Health Crisis
Researchers analyzed data from the National Health and Nutrition Examination Survey (NHANES) spanning 2001 to 2023. Their findings show that although general obesity (BMI ≥ 30 kg/m²) remains a major concern, the surge in cases of extreme obesity-defined as a BMI of 60 kg/m² or more-poses unique and urgent challenges. For context, a BMI of 30 kg/m² typically indicates someone is 30 to 40 pounds overweight, whereas a BMI of 60 kg/m² or more reflects an excess of over 200 pounds.
Dr. Philip Schauer, director of the Metamor Institute at Pennington Biomedical, emphasized the gravity of this trend: “Most attention is focused on the category of general obesity, but there is less attention paid to prevalence of obesity of 60 BMI or greater, a category associated with an increased clinical burden, impaired mobility and elevated healthcare costs. This study is the first to categorize the growing pervasiveness of this extreme degree of obesity, but its gravity is not to be understated, as patients in this category face far greater health risks and comorbidities”.
Health and Healthcare System Impacts
The study estimates that more than 850,000 Americans now fall into this extreme obesity category, a group facing heightened risks for diseases such as type 2 diabetes, heart disease, and certain cancers. Many individuals with a BMI above 60 kg/m² experience severe mobility limitations, frequent hospitalizations, and are often unable to work due to disability.
The rise in extreme obesity also presents significant challenges for the healthcare system. Standard medical equipment often cannot accommodate patients of this size, complicating procedures such as imaging, anesthesia, and surgery. This can result in delays or an inability to provide essential care, further exacerbating health disparities for this vulnerable population.
Medication and Treatment Gaps
The increase in extreme obesity has occurred alongside the growing use of GLP-1-based medications, which have shown promise for weight loss. However, the effectiveness of these drugs in individuals with BMIs above 60 kg/m² remains unclear, as clinical trials have generally included participants with much lower average BMIs.
Call to Action
Dr. John Kirwan, Executive Director of Pennington Biomedical, called the findings a wake-up call for healthcare providers and policymakers: “The rate of growth in cases of obesity with a BMI of 60 or greater sends an urgent message to develop the necessary resources and infrastructure to address the challenges posed by this condition”.
Shifting Trends in Weight Categories
The data also show a decrease in the proportion of adults with normal weight (BMI 18.5–24.9 kg/m²) and those classified as overweight (BMI 25.0–29.9 kg/m²) over the same period, highlighting a shift toward higher BMI categories in the U.S. population.
Disclaimer:
The findings summarized in this article are based on a research letter published in The Lancet: Diabetes & Endocrinology and represent preliminary, exploratory observations. While the data are peer-reviewed, research letters are shorter than full articles and may report early findings that require further validation. Readers are advised to consult healthcare professionals for medical advice and to consider that ongoing research may provide additional insights into this public health issue.
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