It was not easy to find a problem like "food insecurity" in Germany but finally I found something: http://www.spiegel.de/politik/deutschland/0,1518,428993,00.html
In this article it is well described why you do not now a lot about this issue.
Children who do not have enough money to buy food are ashamed of being poor. They do not talk about that and nobody knows about their problem. Today every sixth child in Germany below 18 is poor and the number is growing.
A solution to that problem would be that the lunch at school is for free like in Scandinavia. But unfortunately Germany ist far away from that. The problem is "half solved" by organizations like "die Arche". They have kitchen where everyone can come and eat.