Let governments take control of food production and distribution and famine is almost inevitable. From Chris MacIntosh at internationalman.com:

The parallels of history are hard to ignore.
Let’s take a look, because what’s happening today on the food front has been tried before.
From the 1930’s through the 1940’s Stalin’s Soviet Union had a “5-year Industrialization Plan” – these central planners never learn. This genius plan involved “rapid industrialization,” together with “socialized farming” and, of course, the elimination of private enterprise and property ownership.
The results? Grumpy people. A LOT of them. What brought about so many grumpy folks was this. Grain exports collapsed, economic output collapsed and more than 30 million starved to death between 1932 and 1947.
Next up, central planner numero deux.
Chairman Mao and the “Great Leap Forward.”
Like Stalin, Mao implemented a “5-year Industrialization Plan” from 1958 to 1962.