Sense of Control and Epigenetic Aging: The Mediating Role of Lifestyle Behaviors

TL;DR

This study shows that a person's sense of control over their life is linked to slower biological aging through healthier lifestyle choices.

Contribution

The study demonstrates that lifestyle behaviors mediate the relationship between sense of control and epigenetic aging.

Findings

Sense of control is linked to slower epigenetic aging through healthier lifestyle behaviors.

The relationship is fully mediated for second-generation epigenetic clocks like DunedinPACE, GrimAge, and PhenoAge.

Sense of control is not significantly related to first-generation clocks like Hannum or Horvath.

Abstract

Psychosocial factors such as purpose in life have been found to contribute to epigenetic aging and lifestyle behaviors may mediate these associations. Sense of control is another promising protective psychosocial factor that has been associated with greater engagement in protective lifestyle behaviors and better health. The present study tested whether sense of control was related to epigenetic age and whether lifestyle behaviors (diet, exercise, sleep, alcohol consumption, and smoking history) were a mediator. We predicted that individuals with a higher sense of control would engage in more protective lifestyle behaviors which would be related to a lower epigenetic age. Data were collected from two sub-study samples, the second (M2; n = 1,255) and refresher (R1; n = 863) waves of the Midlife in the United States Study (MIDUS). We tested our hypothesis with a mediation model using the PROCESS Macro in SPSS. Results showed that the relationships between sense of control and three second-generation epigenetic clocks (DunedinPACE, GrimAge, and PhenoAge) were fully mediated by lifestyle behaviors, adjusting for chronological age, sex, education, race, and study sample. In this model, sense of control was not significantly related to two first-generation epigenetic clocks (Hannum or Horvath clocks), possibly due to their higher correlations with chronological age. Taken together, these findings suggest that sense of control is a promising modifiable psychosocial variable that could be used to promote engagement in protective lifestyle behaviors potentially slowing age-related declines.