Table of Contents
Published: May 18, 2026
Read Time: 4.2 Mins
Total Views: 26
Most of the conversations about how to live longer focus on what we put into our bodies, what we measure inside them, and what supplements or scans or wearables might bend the curve of biological aging in our favor. A new study suggests that one of the more potent variables sits somewhere none of those interventions can reach: the people in our close social network who quietly make our lives harder. The finding is consistent with something I have come to believe more strongly with each year of clinical and public health experience, which is that the determinants of how long and how well we live are mostly outside the body, not inside it.
What the study found
A research team at New York University recently published a study in the Proceedings of the National Academy of Sciences using a representative sample of more than 2,300 adults in Indiana. The researchers asked participants to identify the people in their close social network who “occasionally or often” caused them problems or made their lives more difficult; they called these contacts “hasslers.” Nearly sixty percent of participants had at least one. To estimate biological age, the team used DNA methylation, the pattern of small chemical modifications that accumulate on the genome over a lifetime in ways that can be read as a kind of biological clock. Each additional hassler in a person’s network was associated with roughly 1.5 percent faster biological aging per year, the equivalent of about nine extra months of biological age. People with more hasslers also reported worse self-rated health, higher rates of anxiety and depression, and more cardiovascular disease and diabetes.
The most damaging relationships are the mixed ones
One of the more striking findings in the paper is that the relationships most strongly associated with accelerated aging were not the openly hostile ones but the ambivalent ones, meaning the relationships in which someone provides both genuine support and recurrent stress. Purely negative relationships are easy to identify and, eventually, to leave. Ambivalent relationships keep you close, keep you invested, and keep the underlying stress going for years. The biological signature of that kind of chronic, low-grade interpersonal strain appears to leave a measurable trace on the genome.
How to read this evidence
I want to be honest about what this study can and cannot tell us. DNA methylation clocks are an active and sometimes contested area of research, and there is real debate about whether the chemical changes they measure constitute aging in any deep biological sense or simply correlate with it. The findings here are also associations, not proof of causation, and the population studied is not representative of the country as a whole. With those caveats acknowledged, the broader pattern is consistent with decades of social epidemiology showing that the people we live among, work alongside, and depend on shape our health in ways that rival or exceed many of the medical interventions we spend our money on.
That broader pattern is part of why I have argued before that the longevity industry’s most heavily marketed products tend to be the wrong place to look for meaningful gains in lifespan or healthspan. The biggest improvements in how long Americans live have come from public health investments in air, water, food safety, and infectious disease control, not from premium diagnostics or branded supplements. The new evidence on social relationships fits that same picture. Whether or not a single methylation study captures aging perfectly, the underlying claim it points toward is one I am inclined to take seriously, because health, whether we are talking about preventing infections or living longer, depends far less on the medications and tests we consume than on the air we breathe, the water we drink, the food we eat, and the people who fill our days.
That last category is the one most of us have the most control over, and the one we tend to think about least in the context of our own health. The implication of this study is not that anyone should run a cost-benefit analysis on the people in their lives. The implication is that chronic interpersonal stress is not a soft variable, and the ambivalent relationships we tolerate for years out of habit or obligation may be exacting a price we have not yet learned to see.
