The 5 elements of nature, Earth, Water, Fire, Air and Ether (Space), has a close relationship with human body. Imbalance in these elements causes disease.
JKYog Natural Cure
Where are the Naturopathy doctors in India (intelligent doctors) and a effective well observed treatment? - Quora
Naturopathy: Your guide to good health
IJERPH, Free Full-Text
BG 2.28: Chapter 2, Verse 28 – Bhagavad Gita, The Song of God – Swami Mukundananda