Weight Management

I am going to use my blog to document my trials and tribulation with my weight.  I go down and then back up.  I can stay on a diet for a week or two, then gain it all back.  If I buy clothes after I lose weight, then I gain weight and can not wear them.  Why do I do this, why can't I stay on a diet.  I have more diet books than should be allowed.  Recently I have been tuning into Dr. Oz 11 weeks to optimum health.  I read to motivate myself, but it only last so long.  I can be encouraged, but what goes on that causes me to fail.  I know how to eat healthy, lean proteins and vegetables.  Protein with everything.