If you're planning on ciiuontnng to run the marathon be careful not to lose too much weight. It can actually drain you further because you may not have enough energy storage to finish the race.A good diet to run a marathon and safely lose weight is High Fiber and High Protein and Medium CarbsHigh Fiber Will help to fight cholesterol build up and help you process nutrients more effecientlyHigh Protein Will provide slow converting energy and muscle rebuilding. This will allow more long-term exercisesMedium Carb I will even venture to say high carb if you run a lot consistently to be able to maintain energy for the first half of the run.Hope this helps

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