MMMC, congratulations on your events! I also enjoy endurance events, typically 2 full and 1 1/2 marathon a year for the past 4 years.
I started IP last June, and had one event after it. I did not train as I normally would and did include some extra protien and an additional restricted each day. I completed a half, and did lose weight...BUT...as I said I did not train with a
PR in mind or anything beyond completing the event.
I have lost 40 pounds, have not reached goal, but am currently entering Marathon training season, so I intend to come off IP for training purposes, get a
PR on each course (with 40 less pounds that should happen!) and then get back on in the fall to lose the last 20.
Maintenance is the hardest part of any weight loss, so that is my focus as far as the weight aspect at this point.
There is a book out on Paleo for Athletes, that sounds intriguing to me and I believe could be similar to IP during training. Just a thought.
Be reasonable, despite having an endurance mentallity!
Find your happy pace and succeed.