Kural - 941

The learned books count three, with wind as first; of these,
As any one prevail, or fail; 'twill cause disease

Explanation
If (food and work are either) excessive or deficient, the three things enumerated by (medical) writers, flatulence, biliousness, and phlegm, will cause (one) disease.

Tamil Transliteration
Mikinum Kuraiyinum Noiseyyum Noolor
Valimudhalaa Enniya Moondru.