I felt something being off for a while now regarding exhaustion levels, and after a series of long exploration trips I figured out what it was: Exhaustion level apparently gets significantly improved/reset every time (eg. from Rested/Below Normal.../Below Normal.. to Well Rested/Normal.../Normal...) when eating anything, not even up to full calories count, essentially negating the need to rest for any other purpose than saving the game.
Is this an intended behaviour? If it is, what's the reasoning behind it?
Customer support service by UserEcho