Well, I'm on a diet. Almost everyone I know needs to lose 5-50 lbs--I'm more on the upper end of things. For the last couple of days, I've been keeping a food journal, it has helped, I'm already down a pound. I think the simple act of writing things down helps me to be more mindful of what I am eating. So if you have a besetting sin, like gluttony, confess it to the Lord and maybe a close friend or two and be aware of how God wants you to move forward.
1 Jn. 1:9 If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.