There's a news story about two Chinese brothers who were trapped in a coal mine and survived by eating coal and drinking their own urine. I'm wondering how much coal one would have to eat in a day to take in 2000 calories.
http://customwire.ap.org/dynamic/stories...
What is the digestible caloric content of Chinese coal?
There are no calories in coal. The coal simply filled their stomachs. It's completely indigestible and poisonous as well. Drinking your own urine will help once but if you keep doing it it gets saltier and saltier.
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