ADHD-Obesity Link Weakens in Big Cities: New Research

May 27, 2025

ADHD raises the risk of obesity, but its effect is dampened for people living in large cities, according to two new studies.

Young adults with combined-type ADHD are more likely than their non-ADHD peers to carry excess weight around their midsection and to have an unhealthy waist-to-height ratio (known as the body mass index or BMI), according to a new cross-sectional study published in American Journal of Human Biology. ¹ Obesity-related health conditions, such as heart disease and Type 2 diabetes, are tied to excess abdominal fat.

“The effect of ADHD on obesity intensified with age,” however, “no significant association was found with blood pressure, but trends suggested hypertension may escalate with age among ADHD individuals,” the study’s authors wrote.

ADHD’s Behavioral and Biological Links to Obesity

The biological link between ADHD and obesity, and the influence of environment on this relationship, was the focus of another new study led by researchers from the Tandon School of Engineering at New York University and the Italian National Institute of Health. ²

The study, published in PLOS Complex Systems, proposed that ADHD influences obesity along two pathways:

1. Behavioral: Difficulties with motivation, planning, and sustained attention may lead people with ADHD to engage in less physical activity, increasing the likelihood of weight gain.
2. Biological: ADHD affects areas of the brain responsible for impulse control, decision making, and reward processing, making people with ADHD more susceptible to impulsive eating behaviors, such as bingeing or choosing high-calorie snacks.

“A lot of people I work with complain about using food for stimulation,” said Nicole DeMasi Malcher, M.S., R.D., CDES, during the ADDitude webinar “Eating with ADHD: Improving Your Relationship with Food.” “They are constantly looking for food to deliver a quick fix rather than thinking about the long-term effects.”

Malcher attributes this behavior, in part, to poor interoception, the ability to sense what’s happening inside the body, including cues such as thirst, hunger, and fullness. “People with ADHD are unable to recognize these cues until they feel really ravenous,” she said. “Then it’s too late, and they make more impulsive eating and food choices.”

ADHD and the City

Living in a city environment may mitigate the risk of obesity for individuals with and without ADHD. The research found that living in a large city offers more opportunities for physical activity, better access to mental health care, and higher overall levels of education, which could buffer the effects of ADHD that lead to obesity.

The NYU/Italian research team analyzed 915 cities in the United States using an urban scaling mathematical model to examine how rates of ADHD and obesity changed as cities grew. Their analysis showed that, in larger urban areas, ADHD and obesity become relatively less common as population grows. At the same time, access to education and mental health services tends to grow faster than the population. In short, bigger cities aren’t just more populated — they’re often better equipped to handle public health issues like ADHD and obesity. In contrast, cities with fewer opportunities for physical activity or more food insecurity demonstrated stronger links between ADHD and obesity.

“Our research reveals a surprising urban advantage: as cities grow, both obesity and ADHD rates decrease proportionally,” says Tian Gan, a co-author of the PLOS study. “Meanwhile, mental health services become more accessible, helping combat physical inactivity — a key link between ADHD and obesity. This pattern suggests larger cities offer protective factors against these interconnected health challenges.”

Similar patterns emerged when the researchers analyzed survey data from 19,428 children across the U.S. as part of the National Survey of Children’s Health. Children with more severe ADHD symptoms were more likely to be obese, especially if they lived in homes with fewer opportunities for physical activity or lower parental education levels.

The researchers also measured the differences between each city’s rates of ADHD and obesity, and those expected for its population, identifying several regional discrepancies. Cities in the Southeastern and Southwestern U.S. displayed greater disparities in ADHD and obesity prevalence, mental health access, and food insecurity than other regions. Neighboring cities often differed significantly, suggesting that local policies and resources could either amplify or reduce these health risks.

“These findings underscore the importance of city-level interventions in mitigating the impact of impulsivity disorders on the obesity epidemic,” says Dr. Maurizio Porfiri, Ph.D., senior author on the PLOS study. “It’s not just about how big a city is — it’s about how it uses its resources. With this kind of insight, policymakers can target investments in mental health care, education, and physical activity to break the link between ADHD and obesity where it’s strongest.”

Intuitive Eating for ADHD

Both studies suggest that effective management of ADHD symptoms can help reduce the risk of obesity and its complications, and that obesity management programs must take into account a patient’s ADHD diagnosis.

The practice of intuitive eating (IE), for example, may help address the underlying neurological traits that influence the eating habits of people with ADHD.

“Intuitive eating, when adapted for the ADHD brain, provides an evidence-based framework that works with rather than against ADHD traits,” Malcher said. “This approach helps reduce overwhelm, prevent binge eating, and create sustainable eating habits without triggering the restriction-binge cycle common in ADHD.”

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