I am not sure of the theological history behind "giving up" something for Lent. I am sure it is rooted in penance of some sort, but for me, this simple act of self-sacrifice has brought focus and discipline I have long needed. I feel as if God is calling me to open myself up to the possibilities he has in store for me.
When I choose to give up something in preparation for a spiritual awakening, I am consciously taking steps to that end. It gives action to my beliefs. I don't think God cares that much what I am giving up as much as he wishes for me to experience what life has for me without the desired behavior.
The journey from chaos to clarity is not about doing what we're told. It's about searching for the voice of God and finding it deep within who we are. It isn't about the reward but about the journey..