Why did Obama nationalize the U S food supply with executive order 13603?

Why did Obama nationalize the U.S. food supply with executive order 13603? Obama quietly signed an Executive Order that has major implications should some sort of national emergency arise, such as enabling the federal government to take over management and distribution of all food, water and other resources. In issuing the order, EO 13603, titled, “National Defense Resources Preparedness,” Obama claimed authority under the Defense Production Act of 1950, a Korean War-era statute (50 U.S.C.) (see it here) that gives the government the power to marshal whatever resources are necessary to protect and defend the country during “military conflicts, natural or man-caused disasters, or acts of terrorism within the United States,” the statute says. In justifying the order, Obama wrote in Section 102 under “Policy:” The United States must have an industrial and technological base capable of meeting national defense requirements and capable of contributing to the technological superiority of its national defense equipment in peacetime and in times of national emergency. The domestic industrial and technological base is the foundation for national defense preparedness. The authorities provided in the Act shall be used to strengthen this base and to ensure it is capable of