Spend vast amounts of money on advertising to convince kids and their families that it's fun fun FUN to eat garbage foods. Said foods are almost completely deficient in B Complex vitamins and magnesium - all of which are brain foods.

Profit. $$$

Then when those kids are adults, spend vast amounts of money on advertising telling them that they just need to "ask their doctor" about all these pills that will make their brains feel better.

Profit. $$$