It was tantalising to get no more than hints into a character that interested me so much. It was like making one's way through a mutilated manuscript. I received the impression of a life which was a bitter struggle against every sort of difficulty; but I realised that much which would have seemed horrible to most people did not in the least affect him. Strickland was distinguished from most Englishmen by his perfect indifference to comfort; it did not irk him to live always in one shabby room; he had no need to be surrounded by beautiful things. I do not suppose he had ever noticed how dingy was the paper on the wall of the room in which on my first visit I found him. He did not want arm-chairs to sit in; he really felt more at his ease on a kitchen chair. He ate with appetite, but was indifferent to what he ate; to him it was only food that he devoured to still the pangs of hunger; and when no food was to be had he seemed capable of doing without. I learned that for six months he had lived on a loaf of bread and a bottle of milk a day. He was a sensual man, and yet was indifferent to sensual things. He looked upon privation as no hardship. There was something impressive in the manner in which he lived a life wholly of the spirit.

请教老师：这一句and when no food was to be had he seemed capable of doing without. 没看懂，麻烦老师分析一下句法结构和含义，谢谢！