Lower levels of household income and education in the United States are associated with higher rates of adolescent obesity. These socioeconomic disparities “have widened during the last two decades,” new research shows.
Because obesity in adolescence has immediate and long-term health consequences, this phenomenon “may exacerbate socioeconomic disparities in chronic diseases into adulthood,” study author Ryunosuke Goto, MD, of University of Tokyo Hospital, and colleaguesin JAMA Pediatrics.
Groups with higher rates of obesity may also be less likely to access treatment, said Kyung E. Rhee, MD, professor of pediatrics at University of California, San Diego School of Medicine, who was not involved in the new analysis.
“These are the families who have a harder time getting to the doctor’s office or getting to programs because they are working multiple jobs, or they don’t have as much flexibility,” Dr. Rhee told this news organization.
20 years of data
A recent study showed a relationship between socioeconomic status (SES) and weight in adults. Research examining current trends in adolescents has been limited, however, according to the authors of the new study.
To address this gap, Dr. Goto and colleagues looked at obesity trends among approximately 20,000 U.S. children aged 10-19 years using cross-sectional data from the 1999-2018 National Health and Nutrition Examination Surveys.
They compared the prevalence of obesity among participants whose household income was 138% of the federal poverty level or less versus those with higher levels of household income. They also examined obesity prevalence according to whether the head of household had graduated college.
Relative to higher-income households, adolescents from lower-income households were more likely to be non-Hispanic Black (21.7% vs. 10.4%) or Hispanic (30.6% vs. 13.4%) and to have an unmarried parent (54.5% vs. 23%). They were also more likely to have obesity (22.8% vs. 17.3%).
The prevalence of obesity likewise was higher among adolescents whose head of household did not have a college degree (21.8% vs. 11.6%).
In an analysis that adjusted for race, ethnicity, height, and marital status of the head of household, the prevalence of obesity increased over 20 years, particularly among adolescents from lower-income homes, the researchers reported.
Lower income was associated with an increase in obesity prevalence of 4.2 percentage points, and less education was associated with an increase in obesity prevalence of 9 percentage points.
By 2015-2018, the gap in obesity prevalence between low-income households and higher-income households was 6.4 percentage points more than it had been during 1999-2002 (95% confidence interval, 1.5-11.4). “When we assessed linear trends, the gap in obesity prevalence by income and education increased by an average of 1.5 (95% CI, 0.4-2.6) and 1.1 (95% CI, 0.0-2.3) percentage points every 4 years, respectively,” according to the researchers.
How to treat
Separately, researchers are studying ways to help treat patients with obesity and increase access to treatment. To that end, Dr. Rhee and colleagues developed a new program called Guided Self-Help Obesity Treatment in the Doctor’s Office (GOT Doc).
The guided self-help program was designed to provide similar resources as a leading treatment approach – family-based treatment – but in a less intensive, more accessible way.
Results from a randomized trial comparing this guided self-help approach with family-based treatment werein Pediatrics.
The trial included 159 children and their parents. The children had an average age of 9.6 years and body mass index z-score of 2.1. Participants were primarily Latinx and from lower income neighborhoods.
Whereas family-based treatment included hour-long sessions at an academic center, the guided self-help program featured a 20-minute session in the office where patients typically see their primary care physician.
Both programs covered how to self-monitor food intake, set healthy goals, and modify the home environment to promote behavioral change. They also discussed body image, bullying, and emotional health. The program is framed around developing a healthy lifestyle rather than weight loss itself, Dr. Rhee said.
Children in both groups had significant reductions in their body mass index percentiles after the 6-month treatment programs. The reductions were largely maintained at 6-month follow-up.
Families in the guided self-help program, however, had a 67% lower risk of dropping out of the study and reported greater satisfaction and convenience. They attended more than half of the treatment sessions, whereas participants assigned to family-based treatment attended 1 in 5 sessions, on average.
The trial was conducted before the COVID-19 pandemic. Next, the researchers plan to test delivery of a guided self-help program via video calls, Dr. Rhee said.
Having options readily available for families who are interested in treatment for obesity proved valuable to clinicians, Dr. Rhee said. “They could then just refer them down the hall to the interventionist who was there, who was going to then work with the family to make these changes,” she said.
The study by Dr. Goto and colleagues was supported by grants from the Japan Society for the Promotion of Science. The trial by Dr. Rhee et al. was supported by a grant from the Health Resources and Services Administration. Neither research team had conflict of interest disclosures.
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