They need more than 500 truckloads of food every day. It is not possible to bring anywhere near that much food through the tunnels, even when there are many tunnels.

The water was turned off even before the greenhouses were officially turned over to the Palestinians. And only about 75 percent of all of the greenhouses were actually turned over. The rest were dismantled and moved to Israel...

http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=46011