From The Emperor Far Away: Travels at the Edge of China, by David Eimer (Bloomsbury, 2014), Kindle p. 132:
From here on, we were in the real Wild West. After Lhatse, there are no more conventional hotels, just shared rooms with dirty, damp beds, concrete floors and no heating. The electricity comes and goes and showers are scarce; in most settlements the only way to wash is with a thermos of hot water. During my time in Ngari, I got to shower just once and grew used to matted hair, a week’s worth of stubble and clothes stained with mud and dust. Smoking furiously in the pit toilets in an effort to disguise their stink became second nature.
Only the food defeated me. China’s cuisines are as diverse as its people and most are superb. Tibet is the exception. Tsampa, thugpa (a noodle soup) and momo (yak-meat dumplings) are the principal national dishes, all accompanied by endless glasses of yak-butter tea. Every morning, Tenzin and the driver Lopa would happily pull out the cloth bags which contained their tsampa, before mixing it with butter tea or water and, sometimes, yak cheese. It was a breakfast I tried just once, and the remorseless meals of momo and thugpa soon began to pall.
I had been spoiled for choice in Lhasa, where there are Nepali places and Tibetan ones that cater to westerners; the finest meal I ate in Tibet was a spicy yak-meat pizza with a yak-cheese base. I was able to vary my diet in Gyantse and Shigatse too, thanks to the restaurants run by migrants from Sichuan. Eating Chinese food induced feelings of guilt, given the way Han culture is encroaching in Tibet, but I blamed Tibetan chefs for their lack of innovation rather than admit my own hypocrisy.
Those meals were a distant memory now. The higher we climbed, the worse the food got. For much of the time, only basic fried rice or thugpa was on offer. Fruit became scarcer and much more expensive. Along with vegetables, it has to be transported down [highway] 219 from Xinjiang, and it is common in Ngari to see Uighurs selling bruised apples from the back of a truck. Even yak meat is hard to find, as the animals are slaughtered only at a certain time of the year and the meat has to last for months.