More weekly miles = more calories??

I started training for a half marathon this week and am running more miles.  I only just started my training log but last week it was more like 12 miles (and the weeks prior were less and less) and this week it will be about 17 miles plus one day of cross training.

I've been doing ok sticking to 1500 calories per day and have lost weight on that but I'm wondering if I should up it a little as I add more and more miles every week.  I have lost 23 pounds since March and would like to lose 10 more but my training is more important then the weight loss right now (as long as I don't gain!  lol)

Everything I've ever read has recommended not attempting weightloss whilst engaged in heavy training.  

That being said, I'm in the same boat as you, I have 10lbs to lose, and am training to PR my 10K, in September, and run my first half marathon race (have done the distance, but never raced it) in October.

This is my plan:  I thought I'd keep track of my calories, in and out, throughout this process, and maintain a deficit of no more than 200 calories per day.  I'll also try to keep that ratio of 2:1:1 for carbs, protien and fat, using nutrient rich foods.  If I find my energy levels are suffering, I'll up the calories.  I'd really like to lose this weight, as I know I was faster when I was 5lbs lighter than now, and I've had more training since, but am 2 minutes slower over 5Km.  

I'm sure some of the running magazines and their related sites probably have some good advice on this.  I think the July issue of Runner's World has an article on weightloss, too.  I'm not sure if it's training related, though.

Good luck with your goals!

OK.  If you were training for a marathon I would totally agree with deirdre_g.  The reason is that when you train for longer events, you have to eat and take in calories while you run.  With a half marathon, not so much.  You can take in one or two gels over the 2+ hours of the half and you will be fine.

As far as calories go....  You should be maintaining a deficit, not a specific number of calories  a day.  If you ramp up your training, you will need more calories to properly fuel your workouts.  If not, then you are going to have sub par results and end up very unhappy.

Equally important is the choices you make.  You want to eat healthy food choices to both fuel your runs and your recovery.  I have not read it, but The Runner's Diet is a book put out by Runner's World you might be interested in.

Good luck!!!