Environmental effects on child growth: The impact of nutrition, parental stress, digital screen time, caffeinated drinks, and night shift schedules

Child growth is a multifactorial process influenced by a combination of genetic and environmental factors. Among the most critical environmental determinants are nutrition, parental stress, digital screen exposure, caffeine consumption, and sleep-wake cycles. This review explores how these factors affect childhood and adolescent growth, focusing on their influence on endocrine function, metabolic health, neurodevelopment, and physical growth trajectories.

Adequate nutrition during infancy and early childhood plays a pivotal role in growth outcomes. Exclusive breastfeeding, balanced complementary feeding, and optimal maternal nutrition have been shown to prevent stunting, obesity, and metabolic disorders. Malnutrition during the fetal and early childhood stages can lead to long-term developmental deficits. Similarly, parental stress has been linked to growth hormone suppression due to elevated cortisol levels, leading to stunted growth and altered metabolic responses. Children exposed to high parental stress often demonstrate lower height-for-age and weight-for-age scores compared to those in stable environments.

Excessive screen exposure has become a growing public health concern, as it is associated with increased obesity rates, delayed motor skill development, and disrupted sleep patterns. Prolonged digital screen exposure suppresses melatonin secretion, which is crucial for maintaining circadian rhythms and normal growth hormone release. Studies indicate that children who engage in more than four hours of screen time per day are at a significantly higher risk of experiencing growth retardation and obesity compared to those with limited exposure.

Caffeine intake, particularly through energy drinks, has also been implicated in altered endocrine function. High caffeine consumption has been associated with increased cortisol levels, reduced melatonin secretion, and delayed puberty in adolescents. Furthermore, night shift schedules and sleep disturbances have been strongly correlated with reduced growth hormone secretion and increased metabolic dysregulation. Adolescents who experience chronic sleep deprivation often exhibit delayed pubertal onset, increased insulin resistance, and compromised overall health.

Addressing these environmental factors through targeted interventions, such as maternal nutrition education, parental stress management programs, screen time regulation, public policies limiting caffeine intake in adolescents, and improved sleep hygiene practices, is essential for optimizing childhood growth. A multidisciplinary approach involving healthcare professionals, educators, and policymakers can help mitigate these adverse effects and support healthier growth trajectories in children and adolescents. Future research should focus on long-term studies evaluating the cumulative impact of these environmental influences to develop evidence-based guidelines for promoting optimal childhood and adolescent development.