Our bodies simply have not yet adapted to the environment of abundance
. It was honed over millions of years to excel in an environment of scarcity; it can't change overnight just because human society has, so quickly and drastically. So if you really want to lose weight you have to work for it just like you do to make money. The idea is to find a balance between eating and staying active, similar to working and living your life - you need to have balance in order to stay at your best and healthiest.