Each service institution shall, insofar as practicable, use in its food service under the program foods designated from time to time by the Secretary as being in abundance. The Secretary is authorized to donate to States, for distribution to service institutions, food available under section
1431 of title
7, or purchased under section
612c of title
7 or section
1446a–1 of title
7. Donated foods may be distributed only to service institutions that can use commodities efficiently and effectively, as determined by the Secretary.