According to a decades-long analysis of two birth cohorts published in BMJ Public Health, where people move and the socioeconomic conditions they encounter matter significantly more for coastal health than proximity to the sea alone. Researchers examining health outcomes in England and Wales found that living on the coast during adolescence does not inherently raise the risk of multiple chronic health conditions in midlife, challenging long-held assumptions about coastal geography and well-being.
Contrasting Perspectives on British Coastal Health and Multimorbidity
The relationship between coastal residence and health in Britain has long sparked debate among public health researchers. According to historical perspectives, British coastal towns grew as health resorts due to perceived therapeutic benefits like salt air and seawater, which proponents link to restorative environments and healthier lifestyles. Conversely, other research connects coastal living to poorer health outcomes, including higher rates of non-communicable diseases. According to published findings, these adverse patterns stem from aging populations, persistent economic disadvantage, the loss of traditional industries, and environmental threats like climate change.
Did you know? Previous studies often relied on distance-based measures or built-up area classifications, which researchers note can blur distinctions between diverse coastal settlements and hinder accurate public health tracking.
Cohort Data Methodology from NCDS and BCS Track Thousands
To evaluate these patterns over a lifetime, researchers utilized data from the 1958 National Child Development Study (NCDS) and the 1970 British Cohort Study (BCS). These landmark projects tracked approximately 17,000 individuals born in a single week across England, Wales, and Scotland. For the BMJ Public Health analysis, investigators evaluated 13,691 NCDS participants tracked to age 55 and 14,683 BCS participants tracked to age 46.
Researchers linked participants’ postcodes at ages 16 and 42 to Office for National Statistics classifications. Multimorbidity was defined as having two or more of nine self-reported, doctor-diagnosed physical and mental conditions, which included asthma, diabetes, backache, cancer, hearing problems, high blood pressure, eye disease, heart problems, and depression. Control variables adjusted for neighborhood deprivation using Townsend index deciles, paternal social class at birth, and sex.
Socioeconomic Deprivation Outweighs Coastal Proximity in Midlife Health
The study revealed that coastal residence during adolescence had no direct link to higher midlife multimorbidity risks in either cohort. Among NCDS participants, living on the coast at age 42 initially showed 22% higher odds of multimorbidity at age 55. However, according to the study authors, that association disappeared entirely after adjusting for neighborhood deprivation. No comparable raw association appeared in the younger BCS cohort.
Migration patterns proved critical to understanding these distributions. Participants who moved away from the coast between adolescence and adulthood showed the lowest predicted probability of multimorbidity—25% in the NCDS group and 13.68% in the BCS group. Conversely, individuals who remained on the coast or moved to coastal areas faced higher predicted probabilities, reflecting selective migration trends rather than direct environmental harms from the sea.
Pro Tip for Public Health Researchers
When assessing regional health disparities, investigators must separate geographical proximity from local neighborhood deprivation indices and migration history to avoid misattributing socioeconomic outcomes to environmental factors.
The Role of Selective Migration in Coastal Communities
Migration analysis demonstrated that individuals who remained in coastal areas from adolescence to adulthood routinely lived in more deprived neighborhoods than those who stayed inland. The likelihood of remaining on the coast increased alongside neighborhood deprivation levels, exposing long-term coastal residents to heightened socioeconomic disadvantage. This trend appeared across both cohorts, with a stronger association noted in the BCS participants.
At the same time, adults who moved into coastal areas frequently originated from less-deprived neighborhoods, though BCS adults often settled into more economically challenged coastal zones upon arrival. People who left the coast, by contrast, generally moved into less-deprived neighborhoods by age 42. These dynamics indicate that health disadvantages in British coastal towns are tied to lifecycle socioeconomic sorting rather than direct hazards of coastal living.
Frequently Asked Questions
Does living by the ocean cause poor health in midlife?
No. According to the BMJ Public Health study, coastal residence itself is not directly associated with higher rates of multimorbidity. Instead, concentrated health issues in coastal areas are closely linked to neighborhood deprivation and selective migration patterns.
What is multimorbidity?
Multimorbidity is defined as living with two or more chronic physical or mental health conditions simultaneously. The study tracked nine specific doctor-diagnosed conditions, including asthma, diabetes, depression, and heart problems.
How did researchers track participants over time?
Researchers analyzed longitudinal data from the 1958 National Child Development Study and the 1970 British Cohort Study, evaluating residential postcodes and health outcomes at specific milestones up to midlife.
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