Why is dieting so hard anyhow!?!

I really do try and have the best of intentions…but somehow I always find a cookie.  Or the cookie finds me.  Whichever excuse helps me sleep better at night.   And so what if I feel the need to eat what is “already in the house”.  My hard earned money bought those snacks.  And it would only be “fiscally smart” for me to eat them…right???