Charak Samhita
स यदा नेन्धनं युक्तं लभते देहजं तदा। रसं हिनस्त्यतो वायुः शीतः शीते प्रकुप्यति ॥१०॥
If adequate food is not made available to the body, then this increased agni consumes/absorbs the rasa(the intrinsic fluids of the body). Vata having sheeta (cold) property gets vitiated in this cold season.
english translation
sa yadA nendhanaM yuktaM labhate dehajaM tadA। rasaM hinastyato vAyuH zItaH zIte prakupyati ॥10॥
hk transliteration by Sanscript