I've lost almost 5 pounds in the last week and a half doing this, and I don't even follow it as strictly as most. Just no grains, dairy, refined sugars, or processed food and I'm already seeing results. I also feel better!
If you did something that hurt someone, and you still feel badly about it, you can go to that person, or write, and apologize. Tell the person you are sorry for what you did or said. Whatever his or her reaction, positive or negative, it doesn’t matter. The very act of repentance, of expressing regret, will set you free.