[bradarner]

Indeed. Which would seem to indicate that positive growth along the Kardashev scale will lead to hypertrophy not atrophy, as conjectured by the OP. One could hypothesize that growing control of energy is highly correlated with the ability to empower a population to increase in muscle mass. Of course, history would seem to indicate that there can also be a correlation to increased obesity.

[kiba]

Doubtful that the energy spent on building muscles is significant as there are also compensating factors that stabilize our metabolic expenditure.