Śivasaṃhitā 5.24

Navayauvana—“new youth”—in this verse does not necessarily refer to biological age but to vitality regenerated by sustained practice. The Śivasaṃhitā recognizes here a phenomenon documented in yogic texts: the advanced practitioner recovers physical qualities associated with youth—luminous skin, clear eyes, abundant energy. This is the effect of systematic prāṇāyāma and controlled diet, not mere enthusiastic rhetoric of the tradition.

Mitāhārin—“moderate eater,” from mita (measured) and āhāra (food)—is one of the pillars of haṭhayoga. The Haṭhapradīpikā establishes that half the stomach should be filled with food, a quarter with water, and the last quarter left empty for the movement of prāṇa. Jitendriya—“conqueror of the indriya”—denotes mastery over the five organs of sensation (jñānendriya) and the five of action (karmendriya).

The combination of renewed youth, moderate diet, and sensory mastery defines what classical texts call yogadeha—the perfectly tuned body of the yogin. This triad is simultaneously cause and effect: practice produces these qualities, and these qualities allow deepening practice. Āyurvedic medicine shares this circular understanding: the healthy body is both condition and result of inner balance.