A major new global study published in the journal Nature Medicine has warned that physical inactivity remains one of the most serious but under-addressed public health challenges of the 21st century, contributing to more than five million deaths every year.
The research, led by Deborah Salvo and an international team of public health experts, argues that the benefits of physical activity extend far beyond obesity and heart disease and should be central to strategies addressing mental health, infectious diseases, cancer and health inequality.
The authors state clearly: “With over 5 million attributed deaths per year, physical inactivity is a major global public health issue.”
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The study highlights alarming global trends in inactivity. According to the researchers, “almost one out of three adults, and eight out of 10 adolescents, do not meet WHO physical activity guidelines.”
The guidelines of the World Health Organization recommend 150–300 minutes of moderate-to-vigorous physical activity per week for adults and at least 60 minutes daily for children and adolescents.
Despite decades of policy advocacy, the researchers warn that progress remains slow and uneven, especially across gender and income groups.
The study emphasises that the popular health message that “every move counts” remains valid but insufficient unless governments also address structural barriers to physical activity.
Deep inequality in access to active lifestyles
One of the most striking findings is the stark inequality in opportunities for physical activity between rich and poor populations and between men and women.
The research found a “40-percentage-point gap in active leisure” between wealthy men in high-income countries and poor women in low-income countries.
The authors describe active leisure as the only form of physical activity largely driven by personal choice, unlike physical labour or transport activity, which often reflects necessity rather than opportunity.
The study notes: “Our global, intersectional analysis… revealed a 40-percentage-point gap in active leisure… between historically privileged groups and historically disadvantaged ones.”
This inequality, researchers say, reflects broader social realities rather than individual motivation alone.
Physical activity helps immunity
The study also draws attention to lesser-known health benefits of exercise, especially its role in strengthening immunity and reducing infection risks.
The researchers argue that “the importance of physical activity in immune function… has been underestimated by scientific consensus groups.”
According to the study, regular exercise improves immune surveillance, reduces inflammation and strengthens immune responses.
It notes that “regular moderate-to-vigorous physical activity boosts immune responses to vaccines, reduces viral loads, [and] lowers inflammation.”
These findings are particularly relevant in a world still dealing with the aftermath of pandemics and rising infectious disease threats.
Strong evidence linking exercise and mental health
The research also confirms strong links between physical activity and improved mental health outcomes, particularly depression.
The authors state: “The available evidence supports that physical activity can help prevent and attenuate depression and depressive symptoms.”
One major meta-analysis cited in the study found that even modest exercise levels can significantly reduce depression risk.
The researchers report that “accumulating half of the recommended amount of physical activity was associated with an 18 per cent lower incidence of depression.”
Meeting full activity guidelines was linked to even greater benefits, with a 25 per cent reduction in depression incidence.
The study also notes exercise can work as a treatment intervention, with evidence showing that activities such as walking, yoga and strength training produce “moderate yet clinically significant effects in reducing depressive symptoms.”
Exercise linked to lower cancer risk
The study also reinforces long-standing evidence linking physical activity to lower cancer risk and better survival outcomes among cancer patients.
The authors note: “Multiple large-scale reviews… report higher levels of physical activity being associated with lower risk of several types of cancer.”
Risk reductions of 10–20 per cent were observed for cancers, including breast, colorectal and gastric cancers, among the most physically active individuals.
For cancer patients, the benefits may be even more striking.
The study reports “37 per cent lower cancer mortality risk among the highest versus the lowest activity group” when physical activity was maintained after diagnosis.
Researchers also found evidence that exercise improves quality of life and treatment outcomes among cancer survivors.
Rethinking physical activity
The study calls for a fundamental shift in how physical activity is understood in public health policy.
Rather than focusing narrowly on weight loss and cardiovascular disease, the authors propose a broader model centred on what they call “physical activity for health and wellbeing.”
The researchers argue that modern public health challenges—including climate change, inequality and mental health crises—require a more holistic approach.
They write that today’s health crises are shaped by “colliding NCD, infectious disease and mental health emergencies.”
This broader model recognises that physical activity patterns are shaped not just by personal choice but by social identity, economic conditions, urban design and public policy.
The study emphasises that health itself should be viewed more broadly, citing definitions that describe it as “complete wellbeing” rather than merely the absence of disease.
Policy action urgently needed
The authors conclude that governments must invest in policies that make physical activity more accessible, especially for disadvantaged populations.
They stress the “urgent need to develop and roll out policies and programs that disseminate and harness the full benefits of physical activity.”
This includes better urban planning, safer walking infrastructure, gender-inclusive sports programs and workplace wellness policies.
Ultimately, the study argues that promoting physical activity may be one of the most cost-effective interventions available to governments seeking to improve both individual and societal health.
As the researchers conclude, the challenge now is to ensure physical activity becomes a central pillar of public health policy rather than a lifestyle afterthought.
This story is done in collaboration with First Check, which is the health journalism vertical of DataLEADS.
