Take your code liver oil. Ugh
My Grandmother lived with us from my age of ~3 (when Mom went back to work). Every afternoon about 2pm I was dosed with a tablespoon of cod liver oil and about 4 oz. of orange juice.
Even after starting school, until about age 8, I was dosed like that. ...Looking back, despite the horrible taste, I believe it really aided my mental development.
Consider: Asian students usually score highest on tests and they have much more fish in their diets than others.