I appreciate your concern @Neo.
No, that is not quite what I mean.
I have been lifting weights 35+ years, & maintain correct BMI (for what BMI is worth; I prefer DEXA).
I do not want to drop below my current weight, & particularly want to maintain muscle mass & bone density.
You may be familiar with the term ‘bulking’, running a caloric surplus to add muscle, followed by ‘cutting’, a caloric deficit to drop the body fat that accompanied muscle growth.
End result; same size, more muscle.
So far I have avoided bulking, & maintain a high muscle mass by recomping & optimised diet (takes longer).
The more I age, the more important I maintain body composition, & do not lose weight, or muscle (or bone). I will now consider bulking/cutting if necessary to achieve this aim. That is what I meant by:
‘I’d rather gain a little weight (which is easy to lose) than risk muscle loss’.
Sarcopenia can set in rapidly in old age (x4 speed in bed rest!) & is incredibly difficult to reverse, as is bone loss. The aim is to not let it happen (as much as age & circumstance allow). In my opinion, it is a one way ticket to frailty, poor quality of life & early death.
My healthspan is more important than my lifespan; I don’t want to be just kept alive, for the sake of it.
I spent Xmas day at an aged facility, it’s so sad, so many beautiful, frail, broken souls, begging for a pill to end it, praying they won’t wake to another day.
It was impactful 
