The greatest blessing is good health (without any disease).
Yudhisthir's answer to Yaksh's question
Mahābhārat
An important advice for maintaining good health is:
यु ताहार वहार य यु तचे ट य कमसु |
यु त व नावबोध य योगो भव त द : खहा ॥ ६ : १७ ॥
Yuktāhārvihārasya yuktachestashya Karmasu