"To become weak from fasting" 或 "To grow feeble due to abstaining from food" 都可以表达“因绝食而衰弱”的意思。其中,“fasting”指“绝食、禁食”,“abstaining from food”同样表达“不吃东西、绝食”的含义;“weak”和“feeble”都表示“虚弱的、衰弱的”。