Brenda Khan
Obesity is a complex, multifactorial disease that results from an imbalance of energy intake and energy expenditure. It is a significant issue in the United States, with over 40% of adults classified as obese. The high prevalence of obesity in the US is influenced by various factors, including diet, physical activity, socioeconomic status, and environmental conditions. While obesity affects Americans across all demographics, certain populations, such as non-Hispanic Black adults, have higher rates of obesity. This public health crisis has led to an increase in health conditions like type 2 diabetes, heart disease, and certain cancers. As a result, there is a growing demand for obesity prevention and treatment options, including diets and lifestyle interventions.
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What You'll Learn
Dietary patterns and physical activity
Healthy dietary patterns are characterized by a variety of nutrient-dense foods such as fruits, vegetables, whole grains, dairy, legumes, nuts, and protein sources. These foods provide essential vitamins, minerals, and other health-promoting components while being low in added sugars, saturated fats, and sodium. In contrast, dietary patterns high in refined carbohydrates, high-calorie drinks, and processed foods with high fat, sugar, and salt content contribute to obesity.
In the United States, there has been a notable increase in obesity rates among adults and children. According to the National Center for Health Statistics, from 1999-2000 to 2017-2018, the prevalence of obesity and severe obesity significantly increased among adult men and women. More than two in five adults (42.4%) are obese, with higher rates among non-Hispanic Black adults (49.6%) and lower rates among non-Hispanic Asian adults (17.4%). Among children and adolescents, there are also concerning trends, with a higher prevalence of obesity among Hispanic and Mexican-American youth.
To address obesity, a multifaceted approach is necessary, involving various sectors such as food manufacturing, marketing, healthcare, and community initiatives. The food industry can promote healthy diets by reducing the fat, sugar, and salt content of processed foods and making nutritious options affordable and accessible to all. Additionally, community efforts should focus on creating safe and supportive environments for physical activity, as well as providing education and resources for healthy eating.
Lifestyle interventions targeting dietary patterns and physical activity can be effective in reducing obesity. For example, a study of healthy reproductive-age women in a Midwestern city found that obesity was associated with adherence to a "Western" dietary pattern characterized by meat, refined carbohydrates, and high-calorie drinks. In contrast, increased physical activity was associated with reduced odds of obesity. Similar interventions can be tailored to different populations to address specific needs and constraints.
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Prevalence of obesity by ethnicity
According to the National Center for Health Statistics, National Health and Nutrition Examination Survey, the prevalence of obesity and severe obesity increased significantly among adult men and women between 1999–2000 and 2017–2018. The age-adjusted prevalence of obesity was 42.4% and the age-adjusted prevalence of severe obesity was 9.2% among adults aged 20 and over in the United States in 2017–2018. The overall prevalence of obesity was similar among men and women, but the prevalence of severe obesity was higher among women.
The prevalence of obesity was lowest among non-Hispanic Asian adults (17.4%) compared with non-Hispanic white (42.2%), non-Hispanic black (49.6%), and Hispanic (44.8%) adults. Non-Hispanic black adults had the highest prevalence of obesity compared with all other race and Hispanic-origin groups. Among men, the prevalence of obesity was lowest in non-Hispanic Asian (17.5%) compared with non-Hispanic white (44.7%), non-Hispanic black (41.1%), and Hispanic (45.7%) men, but there were no significant differences among non-Hispanic white, non-Hispanic black, and Hispanic men. Obesity affects more than 2 in 5 non-Hispanic white men (44.7%), more than 2 in 5 non-Hispanic black men (41.1%), more than 1 in 6 non-Hispanic Asian men (17.5%), and more than 2 in 5 Hispanic men (45.7%).
Nearly 2 in 5 non-Hispanic white women (39.8%), more than half of non-Hispanic black women (56.9%), more than 1 in 6 non-Hispanic Asian women (17.2%), and more than 2 in 5 Hispanic women (43.7%) have obesity. Non-Hispanic black women had the highest prevalence of obesity, followed by Hispanic, non-Hispanic white, and non-Hispanic Asian women. The prevalence of severe obesity was highest among non-Hispanic black adults (13.8%) and lowest among non-Hispanic Asian adults (2.0%).
In 2023, the CDC reported that in 23 states, more than one in three adults (35%) had obesity. In 16 states, White adults had an obesity prevalence of 35% or higher. In 30 states, American Indian or Alaska Native adults had an obesity prevalence of 35% or higher. In 34 states, Hispanic adults had an obesity prevalence of 35% or higher. In 38 states, Black adults had an obesity prevalence of 35% or higher.
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Obesity in adults with higher education
Obesity is a complex disease that increases the risk of hypertension, type 2 diabetes, heart disease, stroke, and certain cancers. It is a result of an imbalance of energy intake and energy expenditure. The rise in obesity can be attributed to multiple factors, including obesogenic environments, psycho-social factors, genetic variants, medications, diseases, and lack of physical activity.
According to the CDC, the prevalence of obesity among adults in the United States was 40.3% during August 2021–August 2023, with no significant differences between men and women. Obesity prevalence was highest in adults aged 40–59 and lowest in adults with a bachelor's degree or higher education. The prevalence of severe obesity was 9.4%, higher in women than in men across all age groups.
Data from the National Health and Nutrition Examination Survey (NHANES) during 2011–2014 revealed that obesity prevalence was lower among college graduates (27.8% of women and 27.9% of men) compared to those with less education. A similar pattern was observed among non-Hispanic white, non-Hispanic black, and Hispanic women, as well as non-Hispanic white men. However, among non-Hispanic Asian women and men, there was no significant difference in obesity prevalence based on educational attainment.
The relationship between educational attainment and obesity varies depending on the economic development of the country. In higher-income countries, there is generally an inverse association, while in lower-income countries, a positive association is observed. This suggests that in developed nations, higher education may contribute to a lower prevalence of obesity, possibly due to increased awareness of health risks, access to healthier food options, and higher levels of physical activity.
To address the complex issue of obesity, a multisectoral approach is necessary. This includes interventions in food manufacturing, marketing, and pricing to promote healthier food environments. Additionally, addressing structural factors, such as poverty reduction and urban planning, can help create supportive communities that enable healthy lifestyle choices.
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The role of the food industry
Obesity in the United States has been linked to a variety of factors, including the food environment and obesogenic environments. The food industry has played a significant role in shaping these environments and influencing dietary choices.
Nutritionist Marion Nestle notes that the problem is not a lack of knowledge about healthy eating among Americans, but rather the food environment that makes it challenging to maintain a healthy diet. Today's grocery stores are filled with sugary snacks, artificial ingredients, and ultra-processed packaged foods, contributing to an increase in obesity rates. The purpose of food companies is to maximize profits by increasing product consumption, which often leads to excessive eating.
The food industry's influence extends beyond individual choices. It shapes the wider food system, including the physical, political, economic, and sociocultural factors that determine what people eat. For example, the clustering of fast-food restaurants around schools and the marketing of unhealthy foods to children and adolescents have been associated with obesity. Additionally, structural factors such as the high cost of healthy and sustainable food, limited access to safe spaces for physical activity, and inadequate legal and regulatory frameworks contribute to obesogenic environments.
To address these issues, multisectoral actions are necessary. The food industry can play a crucial role in promoting healthy diets by reducing the fat, sugar, and salt content of processed foods, making nutritious options accessible and affordable, and restricting the marketing of unhealthy products, especially to vulnerable populations.
Furthermore, the government's role in agriculture and agricultural subsidies has been criticized for prioritizing animal feed and fuel over food production for people. This misalignment of priorities within the food system has contributed to the obesity crisis. Addressing obesity requires a comprehensive approach that includes the food industry, government policies, and community-level interventions to create supportive environments that enable healthy dietary and lifestyle choices.
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Obesity prevention at a young age
Obesity is a complex disease with many contributing factors, including genetics, eating patterns, physical activity levels, and sleep routines. It is important to address obesity prevention at a young age, as childhood obesity can lead to severe health issues in adulthood. About 1 in 5 American children are obese, and this number is even higher for Hispanic and Mexican-American children. Obese children are at a higher risk for asthma, sleep apnea, bone and joint problems, type 2 diabetes, and risk factors for heart disease such as high blood pressure. Moreover, the medical costs for children with severe obesity are $909 higher per year compared to children with a healthy weight.
To prevent obesity at a young age, parents and caregivers can play a crucial role in helping children establish healthy habits. Here are some strategies that can be implemented:
- Offer a variety of fruits and vegetables throughout the day. Frozen and canned fruits and vegetables are often more affordable than fresh produce and are still nutritious. Choose low-sodium or no-salt-added options and look for products packed in 100% fruit juice.
- Ensure that children get enough sleep. Sleep helps prevent type 2 diabetes, injuries, and problems with attention and behavior. Preschoolers need 10-13 hours of sleep per day, including naps, while children aged 6-12 need 9-12 hours of uninterrupted sleep at night. Sticking to a consistent sleep schedule, even on weekends, can improve sleep quality.
- Reduce screen time. Excessive screen time can lead to poor sleep, weight gain, lower academic performance, and poor mental health. Limiting screen time can encourage children to engage in more physical activities and reduce their exposure to unhealthy food cues.
- Encourage physical activity. Enroll children in sports programs or outdoor activities to promote an active lifestyle. This can include signing them up for community sports teams, taking them to local parks, or engaging in family activities like hiking or swimming.
- Model healthy eating habits. Children learn by example, so it's important for parents and caregivers to demonstrate healthy eating behaviors. Eat meals together as a family and involve children in meal preparation to teach them about nutrition and healthy food choices.
- Talk to a healthcare provider. If you are concerned about your child's weight, consult a healthcare professional. They can assess your child's health risks and refer you to a family healthy weight program if needed. These programs offer comprehensive support to help families make positive behavior changes and improve their overall health.
By implementing these strategies, parents and caregivers can help children establish healthy habits that will benefit them throughout their lives. It is important to remember that there is no one-size-fits-all solution to obesity prevention, and a combination of these approaches may be most effective.
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