yes, I read your interesting article, seems the German Plans to get that food out just doesn't to happen, you've got soldiers to feed, you've got distance, you've got stubborn Ukrainians, and poor transport...
Stalin had similar issues a little later, he let 3 million of them starve in the Ukraine, I suppose the Russians had a more effective way of extracting Wheat...
Although everyone was starving in both World Wars. I recall stories of women alive today from those times telling me how they made it through and fed 8 children, most of these children today are missing teeth, hair and other things. Both sides were starving, of course Ludendorf and his men weren't feeling it in WW1 nor were anyone of consequence, I submit this article:
It appears, that the starving class was the poor class, and yes civil unrest was all about, though I imagine no more than in WW2 where if you argued a hungry belly they fixed it with a bullet. I do not think WW1 Germany is likely to shrink to these unfathomables depths but they did commit some minor atrocities in Belgium and Poland...
Furthermore, what you DO NOT take into account what if I take the Treaty against Russia in 1915 or 1916, why should I not get the full benefit of what historically was impossible, since the Ukraine didn't remain in the hands of the CP long enough to yield it's crops
So it's not the lack of transport, or vile soldiers, tough peasants, time is of the essence for WW1 GOA terms, I should have the ability to reap my reward for doing the job "on time" perhaps the Ukraine would've saved Germany but just when she finally succeeded to collapse the Russians.