To us food, drink, clothing, shelter and health are very importunate to us. But in the eyes of God these are really small things. We are told by Jesus not to worry about tomorrow, but to trust that God will provide for us. That doesn't mean we do nothing. We have to work, but we are not to worry. Instead of focusing our energies solely on these small things, we are urged by Jesus not to neglect the more important things. "Seek first the kingdom of heaven and God's righteousness and all these will be yours as well." God wants us to never forget the more important things: our relationship with him, our eternal life with him, the call to holiness, the command of love. In other words, we are to make sure our priorities are in  right order.