S.T.
I wish I knew - I also go through those phases -and when I am in a weight loss mode I think "this is so easy" "it's just about changing the way you live" "it's a lifestyle" - etc. then stresses come along - like my mom in hospice, my daughter in the hopspital, etc - and I lose the ability to stay focused and I think "I deserve these cookies" and while I do "deserve" that one cookie I really don't desrve the entire box of them!!! ;o)
I have just gone through gaining back the 28 lbs I lost a few years ago - so I have to begin again!!