In the tests, 0.15 units per kilogram of body weight produced the same response as 0.5 units of normal insulin.

BBC: Insulin smoke signals breakthrough

He must check all the miners' vital signs and do daily tests as well as keeping a close watch on the men's weight.

CNN: A day in the life of trapped Chile miners

Recent tests on mice found that those who eat when they would normally be asleep put on more weight than others who had meals at normal times, according to a study in the journal Obesity.

CNN: Vital Signs health tips