People always do what seems to be of the greatest
personal benefit.

The problem is when the value analysis is not correct.
For example, if the only time someone's father was nice
to them was when they went for Sunday ice-cream as a
family, then there is a strong mental tie between ice-cream
and good emotions.  Usually the person is unaware of
the root cause, and simply finds they are 'addicted' to
ice-cream.

Thus the truth will set you free, because when you
see all of reality as it really is then all your valuations
of what is best for you are correct in the long run.

Most major religions of the world have some variation
of this, Christianity - the truth will set you free,
Buddhism - Enlightenment will end suffering,
Secularism - science and knowledge makes
for an optimal life.

Not understanding the above concept leads
to food addictions and Wrong Ways of Eating.
In the Instinctive Eating book I recently read
he talks about this problem where humans
do not eat by instinct, but instead eat by
what they think/emote.

Any way,  There is only one truth, but
none of us have all of it.  Paleo eating
may actulay not be appropriate for
people with certain genetic makeup.

R. Keene