What do the little red / green icons mean on the meals goal?

[gsuberland]

On the objectives list, there's a goal for feeding the prisoners, with a set of green and red icons. What do these mean?

[Hessen]

There will be two rows, the top one is how many prisoners there are, the ones in red are hungry the ones in green aren't.

The second line is how many meals you have available, so you can see demand vs supply.