The top bar represents the number of beans available for the division cooks to process THAT EVENING
only. A lot players believe that the amount of beans the gauge shows is
static, but it's not. It's
relative to the time of day that the beans are properly cooked by the divisional catering battalion.
I've said it before and I'll say it again for all the newbies coming on board. Do
not enter into combat without an adequate supply of beans.
Now... onto the second gauge. The second gauge represents the number of weenies (US), bratwurst (GER) or Hormel Spam® (UK) that is present in divisional/corps supply units. Again, the number of weenies are relative to the bean count where b = (w *41) / b+w.
To be honest, I'm never too concerned about the weenies (I'm not that kind of guy), but am hyper-aware of my current bean count. An army without an adequate supply of beans will never fare well in combat. Be especially careful if the Bean Gauge is RED; when it turns this color, that's a
flatulence warning. You should immediately separate the affected division out of the province since the accompanying odor will lower the morale of any and all friendly units within 100km (-40 penalty in urban, -80 penalty in any confined space).
It's all in the manual (p. 427, sec. 9).

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In all seriousness, I always crack up when this question comes up every few months or so since NO ONE has been able to answer what those gauges and colors actually mean.