Charak Samhita
भवतिचात्र- आहारस्यपरंधामशुक्रंतद्रक्ष्यमात्मनः। क्षयोह्यस्यबहून्रोगान्मरणंवानियच्छति ॥९॥
Here is the verse: Semen is the final essence of one’s food hence it should be protected because its depletion leads to many diseases or even death.
english translation
bhavaticAtra- AhArasyaparaMdhAmazukraMtadrakSyamAtmanaH। kSayohyasyabahUnrogAnmaraNaMvAniyacchati ॥9॥
hk transliteration by Sanscript