Gerund: the act or process of causing or becoming abnormally thin.
Prolonged starvation leads to severe emaciating.
Длительное голодание приводит к сильному истощению.
emaciatinggerund / present participle Used attributively or predicatively to describe something that causes or is undergoing emaciation.
The emaciating fever swept through the camp.
Истощающая лихорадка пронеслась по лагерю.