It is a mitzva and a privilege to support the Israeli economy and to eat the produce of Eretz Yisroel which has many mitzvos attached to it.  During the Shmita year and the following year special caution is required.  During any other years terumot and maasrot must be properly removed.  Those foods which have a reliable hechsher have had all halocha issues taken care of.  If an item is labeled as Otzar Bet-Din, as some wines are, it may not be resold nor wasted.  The wine should be consumed before Pesach of the eighth year.  Many fruits and vegetables from Eretz Yisroel are exported to the USA.  Please check labels carefully.  We have posted relevant Shmita dates for many types of produce in the halocha section.