I started packing my own lunch from an early age. But, there were some expectations ingrained in me that I still follow to this day. A lunch consists of:
Sandwich. Fruit. Chips. Dessert.
Of course, there were workarounds for the pubescent mind. Fruit could rightfully substituted for a fruit roll up or Shark Bites fruit snacks. A sandwich could be substituted for a Lunchables make your own pepperoni pizza kit. Even in elementary school, I thought these tasted disgusting. I don't know why I kept making my mom buy them.
But, there was one substitution I was never able to trick my mind into. Because animal crackers aren't crackers. They're cookies. To replace my Doritos with them would simply be disgusting.