Looking for a "sponsor"

Preferably positive, female, 5'5" and approx. 50yo, who successfully lost 35-40 pounds in 5-6 months. Just looking for some extra motivation from someone else's success. :-)

I'm good at the exercise thing (trained all last summer and ran a half marathon in September, and am currently working through P90X)..it's the eating thing that's driving me insame! I'm all gung-ho for, oh, maybe 24 hours, then I relax into the "One bite can't hurt" thing, or someone offers me some homebaking and all resolutions go out the window.

I successfully lost 40 pounds 10 years ago, and since then have gained nearly all of it back. I've been trying for quite some time now to find a groove, but, well, here I am, still with the same 35 pounds to lose. I'm hoping that if someone can share their diet and process with me I might be able to see that losing weight is actually possible.

Thanks!