On means a condition?

"I study hard on an empty stomach" This guy continue studying though he / she feels hungry. What does on mean here? "accompanying with empty stomach? ", "has been hungry ". Is it correct to say that "on " means "being in a condition for a long time " or... show more "I study hard on an empty stomach"

This guy continue studying though he / she feels hungry.

What does on mean here? "accompanying with empty stomach? ", "has been hungry ".

Is it correct to say that "on " means "being in a condition for a long time " or "being in a condition for a time "?
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