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Originally Posted by mojodragon
Currently, I eat about 2300-2500 calories a day. I've always had a high metabolism. As far as training, I'm running about 30 miles a week. Sundays are long days, during which I run at least 10, if not more. I rest on Monday and Thursday.
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A good rule of thumb is to take in an "extra" 100 calories for every mile that you run. So, as your long runs get ... long ..., you may need to eat an extra 1,000 or 2,000 calories above and beyond what you would normally eat. And it should be primarily carbs. And yes, it gets to be a lot of food. A LOT of food. You'll get sick of eating. Keep a food journal. Literally. You should be able to maintain your weight. A bit of strength training will help as well.
Part of training for a marathon is learning how to eat in preparation for it.