Doshas, Prakriti and Vikriti, Agni and Ama as Traditional Concepts

The main ideas at a glance

Doshas

The doshas are three organizing principles called vata, pitta and kapha. One review notes that the idea of the three doshas is a central doctrine of Ayurveda and follows from the first chapter of the earliest text on Ayurveda, the Charaka Samhita. [1] Within the tradition, an imbalance of vata is linked with anxiety and restlessness, pitta with irritability and inflammation, and kapha with lethargy and emotional withdrawal, according to one 2025 narrative review. [2] That is how the framework describes people. It is not a finding from clinical trials.

Practitioners use the doshas to explain why one person's symptoms differ from another's. Whether choices made on that basis improve outcomes compared with standard advice is a separate question, covered on Ayurveda: Traditional Frameworks vs Biomedical Evidence. Individual pages describe vata, pitta and kapha.

Prakriti and vikriti

Prakriti is the traditional idea of constitution: a person's relative proportion of the three doshas, said to be fixed at conception and to stay the same through life. [3] Vikriti is the term for a current imbalance of the doshas, a deviation from the state of one's prakriti. [4] Seven types are described: single (vata, pitta or kapha), dual, or equal proportions. [4] See Dual-Dosha Types.

What research has done with prakriti. Researchers have tried to make prakriti measurable. One 2025 review found 64 assessment tools created between 1987 and 2024, and only 20 had undergone any form of validation. [5] A second scoping review found that questionnaires were the most validated approach despite limited psychometric robustness, and that none of the devices had been appropriately validated. [3]

Human judgment is also uneven. In a study nested in a knee osteoarthritis trial, four Ayurvedic experts examined 30 patients and agreed well on the final main diagnosis but showed fair-to-poor agreement on prakriti and agni (kappa 0 to 0.4). [6] Evidence label: traditional use only for the framework itself; assessment tools are insufficient evidence as clinical measures.

Agni and ama

Agni means "digestive fire." The tradition holds that agni supports metabolism and mental clarity, and that when it is disrupted, toxins called ama accumulate. [2] Ama is a traditional concept; it does not correspond to a specific laboratory measurement. See Agni and Ama.

Links to modern biology: proposals and early findings

Some Indian research groups, often called "ayurgenomics," have asked whether prakriti groups differ biologically. In one genome-wide study, 262 well-classified men (selected after screening 3,416) in three prakriti groups differed at 52 genetic markers. [7] An earlier study reported differences in blood chemistry and gene activity between people of the most contrasting constitutional types. [8] These are small, early studies, mostly in one population, and they do not show that prakriti guides better treatment. Evidence label: preclinical / promising but limited. Another proposal is that epigenetics is an important mechanism of Ayurveda; that is a hypothesis in a discussion article, not a tested result. [9] More on this at Prakriti Research: Genomics.