We know people that eat the food for dinner, then dispose of the rest because they refuse to "eat the same thing 2 days in a row"

The kicker might be that these people are not wealthy. They are dual-income families who do not have a lot to spare. 

hodlpleb

Not only saves time, you also save energy cooking a larger amount at once than cooking half of the same amount 2 times. Re-heating consumes far less energy than cooking.

SnowyLND

culture

Do You Eat Leftovers?

I don't understand the question. Leftovers from eating out?

Because at home we always cook amounts that we will eat for 2-3 days. Isn't that what everybody does? It just saves time, plus you can't know the exact amount you will eat *while* cooking!

Sure, after 2-3 days we would give the "leftovers" to the dogs and cats and cook something else...