Garbha Saṃskāra and Maternal Diet: A Critical Analysis of Ayurvedic Prenatal Care, Fetal Phenotype Development and Epigenetic Programming

Background: The prenatal period represents a critical window of developmental plasticity, where maternal nutritional, physiological, psychological, and environmental factors influence fetal phenotype and lifelong health outcomes. The concept of Developmental Origins of Health and Disease (DOHaD) provides a modern scientific framework explaining how intrauterine exposures regulate developmental trajectories through epigenetic mechanisms. Ayurveda describes a comprehensive prenatal care approach through Garbha Saṃskāra, emphasizing the role of maternal diet (āhāra), lifestyle (vihāra), mental wellbeing, and environmental influences in fetal development. Objective: This review aims to critically analyse the relationship between Garbha Saṃskāra and contemporary concepts of fetal programming, with particular emphasis on maternal diet, fetal phenotype development, and genetic expression regulation. Methods: A narrative integrative review was performed by analysing classical Ayurvedic references from Caraka Saṃhitā Śārīrasthāna along with contemporary scientific literature on maternal nutrition, developmental biology, DOHaD, and epigenetic mechanisms including DNA methylation, histone modification, and non-coding RNA regulation. Results: Classical Ayurvedic descriptions identify fetal development as a multifactorial process involving maternal (mātṛja), paternal (pitṛja), nutritional (rasaja), adaptive (sātmyaja), psychological (sattvaja), and individual (ātmaja) determinants. Modern evidence demonstrates that maternal nutritional status, particularly availability of methyl donors such as folate, vitamin B12, and choline, influences fetal growth, metabolic regulation, and gene expression through epigenetic pathways. Maternal psychological stress also affects fetal development through neuroendocrine and molecular mechanisms. However, direct experimental validation of Garbha Saṃskāra as an epigenetic programming intervention remains limited. Conclusion: Garbha Saṃskāra represents a holistic prenatal framework with conceptual similarities to modern developmental science. While its principles align with established evidence on maternal nutrition and psychosocial influences, rigorous interdisciplinary research is required to validate specific mechanisms and clinical outcomes. Keywords: Garbha Saṃskāra, maternal diet, fetal phenotype, epigenetics, developmental origins of health and disease, prenatal programming