Malaysia’s teenagers can still read, but fewer can understand. As international assessments show a slide in deep reading skills, the country might be slow to realise that comprehension, not literacy, is the quiet workhorse of healthy nation.

When understanding falters, health systems pay—slowly, expensively, and often too late.

A generation ago, public health officials worried about clean water, vaccination rates and the number of doctors per capita. Today, another variable has crept into the equation, less visible but no less decisive, whether patients can make sense of what they read.

In Malaysia, the warning lights are blinking. The 2022 PISA data shows a staggering 27-point drop in reading literacy—with 58% of 15-year-olds failing to reach the minimum proficiency level—and nearly 60% failing in mathematics, behind many regional peers, this decline was significantly exacerbated by pass COVID-19 learning loss from extended school closures, compounding pre-existing literacy and numeracy challenges.

The figures point to a deeper problem where Malaysians can read, but far fewer can understand and apply what they read. Some can read and write but struggle to comprehend, interpret and apply information, says Universiti Malaya’s (UM) Faculty of Education senior lecturer Dr Farah Amirah Mohd Fisal.

“The data itself shows an important distinction between literacy and functional literacy. While Malaysians generally have the ability to read and write, many still struggle to comprehend, interpret, and apply information meaningfully. This suggests that currently, our challenge is not basic literacy, but rather, deeper reading comprehension and critical engagement with text,” she told The Malaysian Reserve.

These figures have been framed, understandably, as an education problem. But that misses the larger point. In a healthcare system that increasingly relies on patients to manage chronic disease, navigate bureaucratic pathways and fend off misinformation, declining comprehension is not a scholastic footnote. It is also a public-health risk factor, one whose effects accumulate quietly and compound over time.

Malaysia’s experience offers a useful case study in what might be called the “proficiency paradox”— a population that is largely literate but increasingly unable to synthesise, evaluate and act upon complex information. Literacy opens the door to health information; comprehension determines whether it is used correctly—or at all.

From decoding to deciding

PISA’s reading test is often misunderstood. It does not ask students to pronounce words or summarise a paragraph. It asks them to integrate information across texts, infer meaning, weigh competing claims and judge credibility. These are precisely the skills demanded by modern healthcare.

“The 2022 PISA data shows a staggering 27-point drop in reading literacy—with 58% of 15-year-olds failing to reach the minimum proficiency level”

Consider the daily realities of a patient with type 2 diabetes. Success depends not on memorising a single instruction but on managing a stream of data, blood-glucose readings, meal composition, medication timing, exercise and warning signs. The patient must know when to adjust behaviour, when to seek help and when an online claim should be ignored. Reading, in the narrow sense, is insufficient. Understanding is the currency that matters.

Clinicians see the consequences of this gap every day. Patients take medicines “twice daily” but not 12 hours apart. They monitor blood pressure but do not recognise patterns that require intervention. Behavioural scientists describe this as “rational non-adherence”, patients follow instructions literally while missing the biological logic and the rationale behind them. The result is not rebellion but misalignment.

Health economists, less politely, call it inefficiency.

The long tail of comprehension

The link between education and health is well established. More schooling is associated with longer life expectancy, lower infant mortality and better management of chronic disease. What is newer is the focus on how people read, not just whether they can.

Studies across OECD countries show that adults with low health literacy—often defined as the ability to obtain, process and understand basic health information—are more likely to be hospitalised, less likely to adhere to treatment and more prone to medication errors. In America, the annual cost of low health literacy has been estimated at tens of billions of dollars. Malaysia has not yet run such calculations, but the mechanisms are the same.

The danger lies in what PISA categorises as “Level 2” proficiency. Readers at this level can identify explicit information but struggle with complex criteria or synthesis. In health terms, this is enough to read a label, but not enough to integrate it with personal context — fasting during Ramadan, shift work, multiple prescriptions or co-morbidities. When fewer than half of students move beyond this level, a large share of the future adult population will be locked out of effective self-care.

“Studies across OECD countries show that adults with low health literacy—often defined as the ability to obtain, process and understand basic health information—are more likely to be hospitalised, less likely to adhere to treatment and more prone to medication errors”

A brief history of a blind spot

For much of the 20th century, healthcare assumed a paternalistic model. Doctors decided; patients complied. Comprehension mattered less because autonomy was limited. As medicine shifted towards shared decision-making in the late 20th century, the cognitive demands on patients grew. Consent forms lengthened. Treatment options multiplied. Responsibility drifted outward.

At the same time, education systems equated literacy with years of schooling and exam performance. The ability to decode text was treated as a finish line, not a starting point. Health literacy emerged as a concept in the 1990s, but remained a niche concern, often relegated to pamphlet design rather than system architecture.

“Malaysians generally have the ability to read and write, many still struggle to comprehend, interpret, and apply information meaningfully” — Dr Farah Amirah Mohd Fisal

The digital revolution widened the gap. Information became abundant, but filters weakened. High literacy enabled access to endless health content; low comprehension undermined the ability to judge it. Social-media platforms often rewarded confidence and virality, not accuracy.

In such an environment, a population that can read but not evaluate is uniquely vulnerable.

Biology meets bureaucracy

The health consequences of low comprehension are not confined to individual behaviour. They interact with the structure of modern healthcare in ways that magnify harm.

Chronic diseases now dominate Malaysia’s burden of illness. Diabetes, hypertension and cardiovascular disease require long-term management rather than episodic care. Outcomes depend heavily on patients’ ability to interpret instructions and respond to feedback. When comprehension falters, control rates drop and complications rise.

“PISA Level 5—the level associated with critical evaluation of complex texts—was almost empty in Malaysia’s latest results”

Administrative complexity adds another layer. Consent forms, insurance rules and referral pathways assume a capacity to process dense text and plan ahead. Patients who cannot do so experience what sociologists call “administrative burden” such as delays, missed appointments and poorly informed consent. Many cope by signing what they do not understand, transferring risk back to the system. Emergency departments then absorb the cost.

There is also a subtler biological interaction. Stress and shame associated with not understanding health instructions can affect emotion, learning and memory, further complicating comprehension. The system, in effect, punishes the very people it confuses.

Misinformation’s unfair advantage

If comprehension is weak, misinformation enjoys a structural edge. False claims are often simpler, more emotionally charged and easier to process than evidence-based guidance. Cognitive scientists call this “processing fluency”, information that is easy to understand feels more truthful and they are everywhere on the social media, some with millions of followers.

Malaysia has seen this dynamic play out in vaccine hesitancy, supplement marketing and unproven treatments for chronic disease. During recent health emergencies, the gap between official guidance and viral narratives was widened by the public’s difficulty in evaluating sources and statistics.

PISA Level 5—the level associated with critical evaluation of complex texts—was almost empty in Malaysia’s latest results. This matters because it is at this level that readers can detect bias, weigh evidence and resist misleading simplifications. Without it, public-health messaging must compete on unequal terms.

The economic arithmetic of poor health literacy

From a policy perspective, declining comprehension is a slow-burn fiscal problem. Poor disease control leads to complications, which are expensive. Administrative inefficiency raises transaction costs. Misinformation undermines preventive programmes, reducing their return on investment.

International data suggest a correlation between national reading proficiency and life expectancy. The relationship is not mystical. Better comprehension improves medication adherence, risk assessment and timely care-seeking. When these skills erode, health spending rises while outcomes stagnate.

Malaysia’s health system, already balancing demographic ageing and rising chronic disease, can ill afford an additional drag. The cost will not appear as a line item labelled “reading comprehension”. It will surface as dialysis rates, stroke admissions and congested emergency rooms.

Designing for understanding

What is to be done? The temptation is to prescribe more information, longer brochures, more websites, denser consent forms. That would be a mistake. The problem is not a lack of data but a mismatch between how information is delivered and how people process it.

Health systems that have taken health literacy seriously focus on design rather than volume. Evidenced-based standards, clear explainers and the “teach-back” method—asking patients to explain instructions and comprehend health info in their own words—have been shown to reduce errors and improve outcomes. These are not soft interventions; they are system controls.

Some countries now treat health comprehension and literacy as a quality metric. Materials are tested with real users. Clinicians are trained to check understanding as routinely as blood pressure. Digital tools translate numbers into actions, not just “your glucose is 9 mmol/L”, but “call your clinic if this happens twice in a week”.

Such measures cost efforts upfront. They save more later.

Education as preventive medicine

None of this absolves schools. PISA’s decline suggests that the cognitive foundations of future health literacy are weakening early. Reading comprehension is a general-purpose skill, as relevant to medical decisions as to exam essays.

Reversing the trend will require changes in pedagogy, not just curriculum. Students must learn to evaluate sources, integrate information, criticise news, evaluate outcomes and tolerate complexity. These are slow skills to build and quick to lose. The payoff, however, extends well beyond employability. It includes healthier lives and lower country’s health burden in the long run.

The uncomfortable implication is that education policy is also an embedded health policy by another name. Ministries rarely act as if this were true. Budgets, targets and accountability structures remain siloed. The data suggest those silos are expensive and they should be treated more holistically.

The view ahead

Malaysia’s falling PISA scores do not doom its health system. But they do change the odds and might quietly turn into a silent crisis. In a world where medicine assumes informed users, comprehension is infrastructure. Ignore it, and systems fail gradually, then expensively.

The debate now is whether policymakers treat this as a narrow education setback or a broader signal. The former invites incremental fixes. The latter demands a rethinking of how health information is designed, delivered and taught.

Literacy opened the door to modern health. Understanding determines who walks through it.

This article is authored by Tony Y, editor-in-chief of PP Health Malaysia (PPHM)