From birth we are subject to our human tendencies to desire. Desire food, desire comfort, desire our mothers. It is true, we need many of these things to survive in our current bodies! How can we escape food from the earth should we want to live upon the earth?
However, as a result of our desire being fulfilled, there arises a new, greater desire. In contrast, if our desire is not fulfilled, there will be a struggle until some alternative result is obtained, and new desire will emerge.
This struggle has been called the Wheel of Samsara by the Buddha because it is a never ending struggle of desire, fulfillment, action, result, desire, result. Desire, action in keeping with the desire, effect resulting from that action, inability to stop desiring, desiring, effect, shifted and new desire…
Helping understand this can help us begin to see an aspect of our suffering in this world. We can begin to see the impermanence of things (anicca), and the unsatisfactoriness of all our desire (duhkha) since it leads continually do new greater desires.