What your fears about the future might reveal about your cellular age

A new study published in Psychoneuroendocrinology indicates that women who experience high levels of anxiety regarding their declining health tend to age faster at a molecular level compared to those who do not.

The concept of aging is often viewed simply as the passage of time marked by birthdays. However, scientists increasingly view aging as a biological process of wear and tear that varies from person to person.

Two individuals of the same chronological age may possess vastly different biological ages based on their cellular health. To measure this, researchers look at the epigenome. The epigenome consists of chemical compounds and proteins that can attach to DNA and direct such actions as turning genes on or off, controlling the production of proteins in particular cells.

One specific type of epigenetic modification is called DNA methylation. As people age, the patterns of methylation on their DNA change in predictable ways. Scientists have developed algorithms known as “epigenetic clocks” to analyze these patterns.

These clocks can estimate a person’s biological age and the pace at which they are aging. When a person’s biological clock runs faster than their chronological time, it is often a harbinger of poor health outcomes and earlier mortality.

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Researchers have previously established that general psychological distress can accelerate these biological clocks. However, less is known about the specific impact of aging anxiety. This form of anxiety is a multifaceted stressor. It encompasses fears about losing one’s attractiveness, the inability to reproduce, and the deterioration of physical health. Women often face unique societal pressures regarding these aspects of life.

Mariana Rodrigues, a researcher at the NYU School of Global Public Health, led a team to investigate this issue. Rodrigues and her colleagues sought to understand if these specific anxieties became biologically embedded in women. They hypothesized that the stress of worrying about aging acts as a persistent signal to the body. They believed this signal might trigger physiological responses that degrade cells over time.

To explore this connection, the team utilized data from the Midlife in the United States (MIDUS) study. This is a large, national longitudinal study that focuses on the health and well-being of U.S. adults. The researchers analyzed data from 726 women who participated in the biomarker project of the study. These participants provided blood samples and completed detailed questionnaires about their psychological state.

The researchers assessed aging anxiety across three distinct domains. First, they asked women about their worry regarding declining attractiveness. Second, they assessed anxiety related to declining health and illness. Third, they asked about worries concerning reproductive aging, such as being too old to have children.

The study employed two advanced epigenetic clocks to measure biological aging from the blood samples. The first clock, known as GrimAge2, estimates cumulative biological damage. It is often used to predict mortality risk by looking at a history of exposure to stressors.

The second clock, DunedinPACE, functions differently. Instead of measuring total accumulated damage, DunedinPACE acts like a speedometer. It measures the current pace of biological aging at the time the blood sample was taken.

The researchers used statistical models to test the relationship between the different types of anxiety and the two epigenetic clocks. They accounted for various factors that could skew the results. These included sociodemographic factors like age, race, and income. They also controlled for marital status and whether the women had entered menopause.

The analysis revealed distinct patterns in how different worries affect the body. The researchers found that anxiety about declining health was linked to a faster pace of aging as measured by DunedinPACE.

Women who reported higher levels of worry about illness and physical decline showed signs that their bodies were aging more rapidly than women with lower anxiety. This association persisted even when the researchers adjusted for the number of chronic health conditions the women already had.

This suggests that the worry itself, rather than just the presence of disease, plays a role in accelerating the aging process. However, the connection weakened when the researchers factored in health behaviors.

When they accounted for smoking, alcohol consumption, and body mass index, the statistical link between health anxiety and faster aging diminished. This reduction indicates that lifestyle behaviors likely mediate the relationship. Women who are anxious about their health might engage in coping behaviors that are detrimental to their physical well-being.

The study did not find the same results for the other domains of anxiety. Worries about declining attractiveness showed no statistical association with accelerated aging. Similarly, anxiety about reproductive aging was not linked to the epigenetic clocks. This lack of connection may be due to the fact that appearance and fertility concerns often fade as women grow older. Health concerns, by contrast, tend to persist or increase with age.

The researchers also combined the scores to look at cumulative aging anxiety. They found that the total burden of aging worries was associated with a faster pace of aging. Like the findings for health anxiety, this association was largely explained by health behaviors and existing chronic conditions.

It is worth noting that the findings were specific to the DunedinPACE clock. The researchers did not observe statistically significant associations between any form of aging anxiety and the GrimAge2 clock.

This discrepancy highlights the difference between the two measures. DunedinPACE captures the current speed of decline, which may be more sensitive to ongoing psychological stressors like anxiety. GrimAge2 reflects accumulated damage over a lifetime, which might not be as responsive to current subjective worries.

The authors propose that health-related anxiety operates as a chronic cycle. Fear of health decline leads to heightened body monitoring. This vigilance creates psychological distress. That distress triggers physiological stress responses, such as inflammation. Over time, these responses contribute to the wear and tear observed in the epigenetic data.

There are limitations to this study that affect how the results should be interpreted. The data was cross-sectional, meaning it captured a snapshot in time. Because of this design, the researchers cannot definitively prove that anxiety causes accelerated aging.

It is possible that the relationship works in the opposite direction. Perhaps women who are biologically aging faster feel physically worse, leading to increased anxiety.

Additionally, the measures for aging anxiety were based on single items in a questionnaire. This might not capture the full depth or nuance of a woman’s experience. The sample also consisted of English-speaking adults in the United States. Cultural differences in how aging is perceived and experienced could lead to different results in other populations.

Future research is needed to clarify the direction of these associations. Longitudinal studies that follow women over many years would help determine if anxiety precedes the acceleration of biological aging. Tracking changes in anxiety levels and epigenetic markers over time would provide stronger evidence of a causal link.

The study supports a biopsychosocial model of health. This model suggests that our subjective experiences and fears are not isolated in the mind. Instead, they interact with our biology to shape our long-term health. The findings suggest that addressing psychological distress about aging could be a potential avenue for improving physical health.

The study, “Aging anxiety and epigenetic aging in a national sample of adult women in the United States,” was authored by Mariana Rodrigues, Jemar R. Bather, and Adolfo G. Cuevas.