I think we come into this world with lots of predispositions. Some
serve us
well as is, others need modification. That means additional,
potentially
less than pleasant, effort for some people in some areas of life.
I read a book maybe fifty years ago about the physical basis of
personality. Since then I have had that in mind as I observe people.
Along with family modeling in eating, sleeping, physical activity,
choice-making, belief systems, spiritual and more, it seems apparent
to me that how we are built contributes to how we act. Early perceived
mental and physical successes tend to create paths and later successes
solidify those paths.