Reducing BMI in adults associated with lower healthcare costs, study suggests
A recent study published in JAMA Network Open highlights the potential for significant healthcare savings when adults with a higher body mass index (BMI) achieve weight loss. The researchers analysed healthcare expenditures for adults with overweight or obesity who were covered either by Medicare or employer-sponsored insurance. Their findings reveal compelling evidence that weight reduction could lead to substantial savings, particularly for individuals with chronic health conditions.
Background
The prevalence of obesity among adults in the United States increased dramatically between 2000 and 2020, rising from 31% to 42%. This trend means that approximately 73% of adults would need to lose weight to meet recommended BMI levels. Excess weight is a well-documented risk factor for numerous chronic diseases, including pulmonary disease, osteoarthritis, cancer, heart disease, hypertension, and type 2 diabetes.
Obesity-related conditions contribute significantly to rising healthcare costs. In 2016, obesity was linked to more than $260 billion in healthcare expenditures, a figure projected to increase to $385 billion by 2024. Most of these costs are borne by employer-sponsored insurance, with Medicaid and Medicare accounting for roughly 25% of the total.
In the workplace, obesity has been shown to lead to increased health-related expenses and workplace accidents. Employees with obesity file double the number of workers’ compensation claims, take three times as many days off due to injury, and have medical claims costs seven times higher than their peers. Additionally, indemnity claim costs for employees with obesity are 11 times higher.
From a health risk perspective, individuals with a BMI over 35 are more than 70% more likely to develop type 2 diabetes during their lifetime. Furthermore, every five-point increase in BMI raises the likelihood of heart failure by about 30%. Excess weight also increases the risk of hypertension by 65% to 78%.
Several interventions aim to address these risks. Lifestyle programmes can achieve weight reductions of 5% to 7% and are considered cost-effective. While bariatric surgery is highly effective, it is also expensive and carries risks, including the need for follow-up procedures. Medicare currently covers bariatric surgery for individuals with a BMI of 35 or higher who have a related comorbidity, as well as those with a BMI over 40. More recently, glucagon-like peptide-1 (GLP-1) medications have emerged as an effective treatment option, with the potential to reduce weight by up to 12%. Around one-quarter of individuals using these medications achieve weight loss of over 20%.
About the Study
The study explored the relationship between weight loss and healthcare cost savings, including Medicare spending. Researchers analysed data from cross-sectional surveys conducted between 2001 and 2020. These surveys provided nationally representative data, including self-reported information on healthcare usage, insurance coverage, and medical conditions.
The analysis focused on adults aged 24 to 64 with a BMI of 25 or higher. Exclusions included individuals with annual healthcare expenditures exceeding $506,000, pregnant individuals, and adults with a BMI over 80. The study also considered participants’ household composition, region, education, race, gender, and age. Specific medical conditions examined included arthritis, heart disease, asthma, mental health disorders, hypertension, hyperlipidaemia, and diabetes.
Using this data, researchers estimated healthcare costs associated with varying levels of BMI reduction (5%, 10%, 15%, 20%, and 25%).
Key Findings
The study included 13,435 adults with employer-sponsored insurance and 3,774 Medicare beneficiaries, all with a BMI of 25 or higher. The findings demonstrated a strong link between higher BMI and increased healthcare costs.
For individuals with employer-sponsored insurance, each 1% increase in BMI above 30 corresponded to an additional $326 in annual healthcare costs. For Medicare beneficiaries, the cost increase was $633 per 1% BMI increase. Racial disparities were noted, with Hispanic and non-Hispanic Black participants incurring lower costs than non-Hispanic White participants.
Savings Associated with Weight Loss:
- A 5% reduction in BMI led to annual savings of $670 (8%) for individuals with employer-sponsored insurance and $1,262 for Medicare beneficiaries.
- A 25% reduction in BMI resulted in savings of $2,849 (34%) for employer-sponsored insurance participants and $5,442 (31%) for Medicare beneficiaries.
These savings were particularly significant for individuals with higher baseline BMIs and chronic health conditions. For example:
- Among participants with arthritis and employer-sponsored insurance, a 15% BMI reduction resulted in savings of $4,950.
- For Medicare beneficiaries with hypertension, a 15% BMI reduction led to savings of $3,709.
Overall, the research underscores that reducing BMI, particularly in people with chronic conditions, could substantially lower healthcare costs for both employer-sponsored insurance and Medicare populations.
Conclusions
This study highlights the significant potential for annual healthcare savings through weight loss, particularly for individuals with higher baseline BMI levels and those managing chronic health conditions. However, the research does not account for potential savings from preventing obesity-related conditions in the first place.
Implications for Policy and Practice:
Improving access to effective weight-loss treatments, including lifestyle interventions and GLP-1 medications, could help alleviate the economic burden of obesity on healthcare systems. These findings make a strong case for prioritising weight management strategies as part of broader public health and insurance policies.
As the prevalence of obesity continues to rise, adopting and promoting effective interventions could not only improve health outcomes but also drive meaningful reductions in healthcare spending.
