Congrats on signing up for your first half!!

I struggle with losing weight when I ramp up my training as well. If I am eating at a deficit to lose weight, I can tell I don't have quite as much energy for a great workout. I think it is possible if you plan your meals well. Like, the day before a long run I won't have much of a deficit because I eat a carb heavy dinner to fuel up for my long run. I don't eat before my long run and then drink a gatorade after.....I am usually not hungry for a while after a long run, so I use that to my advantage and skip breakfast that day, eat a high protein lunch with some carbs (egg whites, bagel thin, veggies), a sensible snack (pita chips and hummus) and last night I had two veggie burgers for dinner - with one hamburger bun, ate each as an open faced sandwich with mustard, ketchup and pickles. I had a pretty good deficit yesterday.

If you are just trying to get through the miles and not doing intense interval training, it's probably fine to maintain a deficit. But when I do speed intervals and that kind of stuff, I tend to be very hungry! Friend me if you want, I am training for a half in October as well, I'm happy to share my diary, etc if you need inspiration.