Obesity: Economic Aspects

Introduction

Obesity is a major public health concern with significant economic implications. This section explores the consequences of obesity from an economic perspective and reviews interventions aimed at reducing obesity rates.

The Economic Costs of Obesity

Health Consequences Associated with Higher BMI

• Cardiovascular Diseases: Includes heart disease and stroke, which are more prevalent among individuals with higher BMI.

• Type 2 Diabetes: Obesity is a leading risk factor for the development of diabetes.

• Musculoskeletal Disorders: Conditions such as osteoarthritis are more common in obese individuals due to increased joint stress.

• Certain Cancers: Higher BMI is associated with increased risk for some types of cancer.

Types of Economic Costs

• Direct Medical Costs: Expenses related to prevention, diagnosis, and treatment of obesity-related diseases.

• Economic Productivity Costs: Losses due to reduced work output, absenteeism, and disability.

• Externalities: Costs or benefits from obesity that affect others, such as increased public health spending.

Medical Costs of Obesity

Measurement of Medical Costs

• Researchers estimate costs by analyzing data from private insurers, Medicaid, and Medicare, as well as self-reported medical expenditures.

• Studies focus on chronic diseases linked to obesity, considering costs for prevention (e.g., medication, education), diagnosis (e.g., blood tests), and treatment (e.g., surgical procedures).

• Comparisons are made between medical costs incurred by individuals in different weight categories.

Findings from Cost Studies

• Different approaches yield varying estimates of total costs.

• For example, Cawley et al. (2021) found that in 2016, total direct medical costs of obesity in the US were $260.6 billion:

  • $139.4 billion paid by private health insurance

  • $79.9 billion paid by public health insurance (Medicare)

  • $41.3 billion in out-of-pocket expenses

• Some studies may overstate costs due to reliance on cross-sectional data, which may not account for premature mortality.

• Health costs associated with excess weight are non-linear in BMI; higher BMI classes incur disproportionately higher costs.

Medical Costs by Obesity Class

Obesity is classified by BMI:

• Obesity Class I: BMI 30-35

• Obesity Class II: BMI 35-40

• Obesity Class III: BMI >40

Additional info: Medical costs rise sharply with increasing obesity class, as shown in multiple studies (see bar chart and box plot in slides).

Economic Productivity Costs

Channels of Economic Costs

• Wages: Obesity may affect hourly earnings, though wages are an imperfect measure of productivity.

• Employment: Obesity can impact job opportunities and increase likelihood of disability.

Absenteeism and Productivity

• Obese individuals are more likely to miss work due to health issues and medical visits.

• Cawley et al. (2021) found that obesity raises job absenteeism by 3.0 days per year (from 2.3 to 5.3 days). Severe obesity (BMI >40) increases absenteeism further.

• Estimated annual productivity losses due to absenteeism range from $13.4 billion to $26.8 billion in the US.

Presenteeism and Wage Effects

• Presenteeism: Obese individuals may be less productive at work due to fatigue and health issues.

• Associations between wages and obesity vary by gender and race:

  • For white males, wage reductions are small and not always statistically significant.

  • For women, especially white women, wage reductions are larger and more precisely measured. Every 10lb increase in weight is associated with a reduction in white women's wages.

  • Obesity may also reduce employment due to increased disability rates.

Employment Discrimination

• Experimental studies show that obese individuals are less likely to be called for job interviews.

• The effect is larger for women and varies by occupation:

  • Pre-school teaching: 30% less likely to be interviewed

  • Accountant: 17% less likely

  • Restaurant position: 44% less likely

• Discrimination: These findings reflect discrimination based on appearance, and may be compounded by sexism.

Externalities of Obesity

Definition and Examples

• Externality: A cost or benefit from an activity that is borne by an entity not directly involved in that activity.

• Examples include increased costs to public health programs (Medicare, Medicaid) funded by taxpayers, and higher insurance premiums for all due to obesity-related claims.

• Opportunity costs arise when funds spent on obesity research or treatment could be used for other beneficial investments.

• Quantifying externalities is challenging due to their diffuse nature.

Interventions to Reduce Obesity

Worldviews on Causes of Obesity

• Individual Behavior: Excessive consumption of processed foods and sugar-sweetened beverages, and reductions in physical activity.

• Food System Changes: The creation of an obesogenic environment—one that promotes weight gain through increased availability and lower prices of unhealthy foods, and the coexistence of food deserts.

Individual Actions

• Preventative health check-ups, abstaining from unhealthy behaviors, and regular exercise can reduce obesity risk.

• Despite benefits, many individuals do not take these actions due to behavioral, social, or economic barriers.

Workplace Wellness Programs

• Employer-provided programs designed to enhance wellness, change behavior, and create supportive environments.

• Components include biometric health screening (weight, BMI, blood pressure, cholesterol, glucose, aerobic fitness), health risk assessments (lifestyle, medical history), and targeted wellness activities.

• In 2016, among firms with 200+ employees, 53% offered biometric screening, 59% offered health risk assessments, and 50% offered wellness activities. Average annual cost: ~$700 per employee.

Evaluating Interventions: Randomized Control Trials (RCTs)

• RCTs: Randomly allocate eligible individuals to treatment or control groups to assess intervention effects and overcome selection bias.

• Example: Illinois Workplace Wellness Study at UIUC, involving biometric screening, health surveys, and wellness activities with monetary incentives.

• Data collected included employment status, absenteeism, health claims, and participation in wellness events.

Findings from the Illinois Workplace Wellness Study

• No significant impact on physical activity, medical spending, or productivity (promotions, firings, sick days).

• Positive effects on employees' perception that management cares about their health and likelihood of being screened for health conditions.

• Selection effects: Participants more likely to be female, staff (not faculty), have lower incomes, lower pre-intervention medical costs, and higher baseline health behaviors.

• Overall, no rigorous evidence that wellness programs improve employee health or incentivize exercise.

• Low uptake and persistence, even with monetary incentives.

Summary Table: Economic Costs and Interventions

Additional info: The economic burden of obesity is multifaceted, affecting individuals, employers, and society. Effective interventions remain challenging due to behavioral and systemic barriers.