One can eat wisdom?
A less intelligent child will certainly not get smarter by eating. But it can develop its systems better through an optimal supply of nutrients. In the first years of school, it is mainly "non-verbal" intelligence that develops. Vitamins and minerals play a role here.
It was observed, that secondary school children are less well supplied with vitamins than high school students.
So bring on the colorful pills for the little ones? Definitely not! Who the principles of healthy eating, as explained in this book, observed, need not fear any gaps in the supply.