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each DNA ends with a tail which carry no information: it was considered to be simply junk, until was discovered that it becomes shorter with each dividing of cells, and when this tail finishes, cells divide no more and the person dies. So, reducing calory intake by one quarter, shortening of this tale slows down, it means, the life span of person becames longer. But it is not possible, because after some time a person becomes too weak. But further experiments proved that same result can be achieved by fasting for 1,5 day once or twice a month