One in Three Middle-Aged Americans Struggle with Basic Health Literacy, Northwestern Study Finds
核心洞察
A Northwestern University study of 1,000 adults found 32.5% of Americans aged 35–64 have limited health literacy, struggling with prescription labels, medical forms, and recalling physician instructions.
Lower health literacy was associated with lower income, less education, unemployment, more chronic conditions, and poorer cognitive performance.
This is the first study to focus specifically on middle-aged adults, as prior research had concentrated on populations 65 and older.
A new study from Northwestern University has revealed that nearly one in three middle-aged American adults lacks the basic health literacy skills needed to navigate the healthcare system effectively. Published in the Journal of General Internal Medicine, the findings highlight a pervasive and underrecognized problem among adults aged 35 to 64.
The study, which included 1,000 participants receiving care at Northwestern-affiliated hospitals and federally qualified health centers throughout Chicago, found that 32.5% had limited health literacy. These individuals struggled with tasks such as reading prescription instructions correctly, understanding medical forms, and recalling details from doctor visits involving chronic condition diagnoses.
"We didn't think the problem was going to be this pervasive, but to think that people are reaching their mid to late 30s and 40s, and they haven't been onboarded properly to perform basic personal health tasks is pretty powerful," said corresponding lead author Abigail Vogeley, a research fellow and neuropsychology doctoral student in the Center for Applied Health Research on Aging at Northwestern University Feinberg School of Medicine. "This work is not about pointing out what people can't do, but rather, can we confuse patients less?"
A First Look at Midlife Health Literacy
While previous research has established that more than half of adults aged 65 and older have difficulty engaging with the healthcare system, this is the first study to focus specifically on middle-aged adults. The timing is particularly significant, as chronic conditions such as high blood pressure (搜索), high cholesterol (搜索), and diabetes (搜索) commonly emerge during midlife.
"In midlife, there's no clear 'user manual' for engaging with healthcare," said senior author Michael Wolf, PhD, MPH, the center's director and the James R. Webster, Jr., Professor of Medicine. "Our findings suggest we're not adequately preparing people to engage and manage their care."
Study Design and Key Findings
To qualify for the study, participants had to have had at least one doctor appointment within the past year or have a visit scheduled in the next six months. They completed interviews and hands-on tasks, including interpreting prescription labels — determining whether medications should be taken with food, or whether alcohol or sunlight exposure posed risks — and recalling physician instructions after watching a clinical video in which they were diagnosed with GERD (搜索).
The researchers assessed health literacy, health self-management, and self-reported physical function using a variety of screening tools. Beyond the headline finding of 32.5% with limited health literacy, the study revealed that lower health literacy was linked to lower income, less education, and unemployment. Those with poorer skills also had more chronic conditions, were prescribed more medications, and performed worse on cognitive testing.
"Patients differ not just by demographics, but by their ability to manage their care," Vogeley said.
Implications for Medication Adherence and Outcomes
The study raises concerns about how patients actually take their medications. "Doctors may ask patients, 'Are you taking your medicine?' but we don't ask how they're taking it, so people might think, 'I am doing great, I'm taking my medicine,' but they don't realize they're making mistakes," Wolf said.
A large body of previous research has found that about two-thirds of U.S. adults from age 45 to 64 manage at least one chronic condition, with a third managing multiple chronic conditions. Failure to manage these conditions properly can result in hospital stays and worse health outcomes.
"We just assume people in middle age may know what they are doing when it comes to their health, even though this is a time where chronic conditions start to appear, and they're often delayed in their diagnosis because of how patients variably use healthcare," Wolf said.
A Call for System-Level Change
Currently, many patient materials are written at a high school or college reading level. The authors recommend simplifying health information using plain language at a 6th- to 8th-grade level. They also argue for broader systemic investment in patient comprehension.
"Billions are spent developing drugs, but far less is invested in helping patients use them correctly," Wolf said. "Improving understanding could significantly improve outcomes and reduce harm."
Vogeley emphasized the potential for early intervention. "The focus has always been on older adults, whom we might assume misdose medications because of cognitive decline, but our findings suggest health literacy is suboptimal even in middle age. Middle-aged adults become older adults, so if we look at this from an optimistic perspective, this can be a place for intervention."
The study was funded by the National Institutes of Health under grant number R01AG070212.