From The Gospel of Matthew by Curtis Mitch and Edward Sri, commenting on Matthew 6:24-34:
The word worry is used five times in this short section. Worry denotes excessive concern and anxiety that monopolizes the heart’s attention. Jesus says do not worry about your life or about your body and then lists three specific areas of concern that represent the necessities of life: eating, drinking, and clothing. While these are important, they are not the ultimate goal of life: Is not life more than food and the body more than clothing? We should look after these basic needs, but focus on what is more important.