I'm not sure this sort of calculus is helpful: Eat less and exercise more, duh! Also works for saving: earn more and spend less, duh! Making friends: be nice

I'm not sure this sort of calculus is helpful: Eat less and exercise more, duh! Also works for saving: earn more and spend less, duh! Making friends: be nice more and mean less, duh! Stress: sleep and relax more and worry less, duh! Marriage: communicate and date more and fight less, duh! Fat people want to be thinner. There are plenty of negative incentives to being fat. There's something subtler and more complex going on here.