Technically of course the correct formula is: weight = starting mass + mass added - mass lost. And just as it's completely obvious, I also think it's completel

Technically of course the correct formula is: weight = starting mass + mass added - mass lost. And just as it's completely obvious, I also think it's completely useless for understanding how to live a good life at a desired body weight. There is clearly a lot more going on, as can be seen by the plethora of different medications, organisms and substances that cause weight change in every conceivable direction.