People have always been searching for methods to stay young and live longer. For
example, in the European middle ages alchemists were looking for the “potion of life”.
This elixir, also known as the elixir of immortality and sometimes equated with the
philosopher’s stone, is a legendary potion, or drink, that grants the drinker eternal life
or eternal youth. So far no elixir has been found. The same holds for the fountain of
youth, a legendary spring that reputedly restores the youth of anyone who drinks of its
waters. Despite all these efforts it was not until the beginning of the twentieth century
that a non-invasive way to prolong life-, and healthspan was found: dietary restriction.
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