Recalled Neighborhood Environments, Parental Control, and Cytokine-Mediated Response to Viral Challenge

Human immune and metabolic biomarker levels, and stress-biomarker associations, differ by season: Implications for biomedical health research

Although seasonal changes in physiology are well documented, little is known about how human immune and metabolic markers vary across seasons, and no studies have examined how stress → health biomarker associations differ across the year. To investigate these issues, we analyzed data from 2118 participants of the Midlife in the United States (MIDUS) study to determine whether there were differences in (a) levels of 19 immune and metabolic markers, and (b) the association between perceived stress and each biomarker across the year. Results of component-wide boosted generalized additive models revealed seasonal patterning for most biomarkers, with immune proteins generally peaking when days were shorter. Moreover, whereas levels of hemoglobin A1C rose from late fall to spring, triglycerides were elevated in the summer and fall, and high-density lipoprotein decreased steadily from January to December. Urinary cortisol and cortisone exhibited opposite patterns, peaking at the beginning and end of the year, respectively. Most critically, we found that the effects of perceived stress on 18 of the 19 health biomarkers assessed varied by month of measurement. In some cases, these differences involved the magnitude of the stress → biomarker association but, in other cases, it was the direction of the effect that changed. Studies that do not account for month of biomarker assessment may thus yield misleading or unreproducible results.

The protective role of parental vigilance in the link between risky childhood environments and health

Growing up in a risky environment is associated with poor lifespan physical and mental health. However, promotive factors that have protective or compensatory effects (i.e., buffer against negative outcomes or promote positive ones in the context of risk) allow individuals to remain healthy despite adverse upbringings. Parental vigilance, including parents' efforts to set boundaries and limitations and/or monitor and have knowledge of children's daily lives, has been shown to buffer and protect against negative health outcomes among individuals who grow up in risky environments. Conversely, some aspects of parental vigilance have been shown to be maladaptive for, or unrelated to, health among individuals who are raised in low-risk environments. The current study leveraged longitudinal data from the National Longitudinal Survey of Youth 97 (NLSY97; https://www.nlsinfo.org/content/cohorts/nlsy97) to explore the link between environmental risk in adolescence and indices of physical and mental health in young adulthood, and whether parental vigilance (limit-setting and knowledge) buffered these associations (n = 4829). Results indicated that childhood environmental risk predicted a greater likelihood of experiencing physical health limitations at age 29 but was not significantly associated with mental health symptoms at approximately age 34. Further, there was evidence that parental limit-setting (but not knowledge) buffered the relation between childhood risk and physical health limitations, such that the association between risk and physical limitations became slightly less pronounced at greater levels of parental limit-setting. Additionally, maternal knowledge was associated with fewer mental health symptoms in young adulthood among all participants. Results highlight the importance of parental limit-setting in reducing physical health consequences associated with childhood risk and suggest that there may be long-term mental health benefits of maternal knowledge of adolescents, regardless of childhood risk exposure.

Childhood Neighborhood Disadvantage, Parenting, and Adult Health

INTRODUCTION

Growing up in disadvantaged neighborhoods is associated with poor adult health indicators. Consistent and supportive parenting plays a key role in life-long health, but it is not known whether positive parenting can mitigate the relationship between neighborhood adversity and poor health. This study examines parenting as a moderator of the links between childhood neighborhood characteristics and adult health indicators.

METHODS

A sample of 305 individuals (61% female; 82% African American, 18% Caucasian) were assessed in childhood (T1; age 11 years; 2003‒2004) and adulthood (T2; age 27 years; 2018‒2021). At T1, neighborhood poverty was derived from census data; neighborhood disorder was reported by parents. Children reported on parental harsh discipline, inconsistent discipline, and parental nurturance. At T2, health outcomes included BMI, serum cortisol and C-reactive protein (CRP), and salivary DNA methylation index related to CRP. Regression models predicted T2 health outcomes from T1 neighborhood and parenting variables and their interactions, adjusting for clustering and confounders. Data were analyzed in 2021.

RESULTS

Neighborhood poverty was associated with lower cortisol, whereas neighborhood disorder was linked with CRP‒related DNA methylation. Multiple interactions between neighborhood and parenting variables emerged, indicating that adverse neighborhood conditions were only related to poor adult health when combined with inconsistent discipline and low parental nurturance. By contrast, warm and supportive parenting, consistent discipline, and to a lesser extent harsh discipline buffered children from poor health outcomes associated with neighborhood disadvantage.

CONCLUSIONS

Interventions enhancing consistent and nurturing parenting may help to reduce the long-term associations of neighborhood disadvantage with poor health.