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When
you
have
eaten
enough
to
meet
your
needs,
your
digestive
system
sends
a
message
to
your
brain.
Research
suggests
that
the
brain
does
not
receive
this
satisfaction
signal
until
twenty
minutes
after
you've
eaten
enough.
It
seems
like
a
glitch
in
the
system,
and
over-eating
is
the
obvious
consequence.
But
overweight
mammals
do
not
exist
in
nature
because
they
are
soon
eaten
by
predators.
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