Astanga Hrudaya
जायते विपुलं चायुर्गरेऽप्येष विधिः स्मृतः। विरुद्धमपि चाहारं विद्याद्विषगरोपमम्॥२९॥
In a person who has been given Gold bhasma for a long time, the poison can not do any harm, similar to a water drop that can not touch the leaf of the lotus. The person gains long life. The same treatment is followed in Gara Visha (chronic poisoning) also. On many occasions, consuming two food items together or a particular type of food processing may render the food toxic. It is called as incompatible food. Even incompatible foods should be considered similar to poison / artificial poisoning.
english translation
jAyate vipulaM cAyurgare'pyeSa vidhiH smRtaH। viruddhamapi cAhAraM vidyAdviSagaropamam॥29॥
hk transliteration by Sanscript