Dr Levine was a member of the team which showed that an increased level of autophagy, brought on by the stress of living in a constant state of near-starvation, was the mechanism responsible for this life extension.

ECONOMIST: Exercise and longevity

In the crowded child nutrition centre, I saw four babies in a state of the most extreme starvation, skin stretched tight over bones.

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The Alabama state legislature has drawn up the Starvation and Dehydration Prevention Act, which prevents the removal of a feeding tube without written instructions from the patient.

BBC: A younger Terri Schiavo