Background: In Ayurveda, Ahara is considered one of the fundamental pillars sustaining life, as it directly influences digestion, metabolism, and tissue nourishment. The concept of Ahara Parinamakara Bhava describes six physiological factors - Usma, Vayu, Kleda, Sneha, Kala, and Samyoga - that collectively regulate the transformation of food within the body. Understanding these factors is important for explaining digestive regulation and metabolic balance in both classical and contemporary perspectives. Methods: The present study is a qualitative conceptual review based on classical Ayurvedic literature and relevant modern scientific publications. Descriptions related to digestion and metabolism were analyzed from Charaka Samhita, Sushruta Samhita, Ashtanga Hridaya, and Ashtanga Sangraha. Contemporary studies related to digestive physiology, intestinal barrier function, immune regulation, and metabolic inflammation were also reviewed to establish physiological correlations. Discussion: The analysis indicates that Usma corresponds to metabolic activity and digestive capacity, while Vayu regulates gastrointestinal motility and coordination. Kleda and Sneha maintain hydration, lubrication, and mucosal protection within the gastrointestinal tract. Kala represents the influence of biological timing and circadian rhythm on digestion, and Samyoga emphasizes appropriate food combinations and dietary patterns. Disturbances in these factors may impair digestion, compromise intestinal barrier integrity, and promote immune activation with metabolic imbalance. Conclusion: Ahara Parinamakara Bhava provides an integrative physiological framework linking dietary regulation with gut homeostasis, immune balance, and metabolic health, highlighting its relevance in preventing lifestyle-related disorders.
Dr. Aayushi Choudhary*1, Dr. Sarika Yadav2, Dr. Naina Joshi3, Dr. Meenakshi Mourya4 (Thu,) studied this question.