The best things to fill your time and mind with are selfless things. Jesus Christ spent His life focusing on the will of God. All other preoccupations could send you right back into self and selfish desires...
Look again at Titus 2:11-12, which says that grace teaches us to say, “No” to any worldly passions: For the grace of God that brings salvation has appeared to all men. It teaches us to say “No” to ungodliness and worldly passions, and to live self-controlled, upright and godly lives in this present age. Again, stop projecting, for we ourselves are in need of reformation...
You are not a failure—no one can maintain man-made rules for any length of time because they run against the body’s natural eating, and underneath they are increasing the self-focus and greed. It is inevitable that you will eat more and gain more in the end...
We love the master that we obey. And we obey the master we love. We cannot love both God and food. Either we will hate the one and love the other or we will love the one and hate the other. Do not kid yourself—you cannot be in love with God if you are in love with food...