Comment by maerF0x0

All these things are actually rules of thumb that aim to be easy, and less focused on accurate.

A reasonably close rule of thumb can actually be 1g of protein per cm of height.

Also not accurately represented is that your body absorbs less protein per gram consumed the older you get. (I couldnt find a source with an actual ratio, just recommendations for _more_ as you get older).

When listening to folks like Layne Norton, they have said that surprisingly many people who simply increase their protein inadvertently begin to lose weight due to greater satiety per net calorie. (remember, roughly 20% of protein calories are lost in digesting/absorbing/converting the protein)