A bit more reading reveals the scope of the growing crisis. Aid agencies are able to purchase less food, which sends more of the poor to markets in near-famine areas, which push up prices and reduce supplies.
On short notice, what can we (Americans, mostly) do? North America is the world's breadbasket - we export 105 million tons per year on net, about 40% of all world trade in grain. If we go on a diet, will that ease supplies noticeably? Cutting out meat (which uses much more grain than grain does) might be a way to go. What about switching to cheaper local foods for the summer, cutting out the fuel costs of transport?
Alternately, is it much more cost-effective to give directly to aid agencies? Or should the entire crisis be allowed to work itself out - maybe the run on grain is just that, and when the harvest comes in prices will drop back to 2007 levels. After all, famine is a danger in many countries right now; the threat has yet to materialize.
I'm interested to read any ideas you may have or resources you may be aware of!