There is a strong hardwired instinct for eating food, tasty or not. As I said, the criteria is that it stops you being hungry and makes you feel satiated. Soylent satisfies this instinct.

Do you only ever buy the cheapest available food that stops you being hungry and makes you feel satiated? Why or why not?

Granted, some preferences may not be “hardwired”, but it doesn't make them any less real.