Nutrition?

   I'm still here, and I am still currently trying to run at least 3miles a day for 5 days a week.  It's a start and it's still hard to do.  Do you know what else is hard?  Eating right.
   I am in no way saying my parents did a lousy job of teaching me to eat healthily.  They did a fine job.  I grew up with the food pyramid, breakfast cereal, and a hot, balanced dinner lovingly prepared by mom served everynight at the same time.  My mom would allow soda and snacks, but she would not allow my brother and me to wash down the whole box of Swiss Cake Rolls with a whole 12 pack of Pepsi either.  She instilled in us a sense of "it's fine, IN MODERATION."  I was also pretty active growing up, so eating was merely fuel.  Honestly, who wants to stop diving for rings or riding your bike on every street in town just to eat?  It was only done unless you had no legs to get your butt to the top of the water tower hill.
  As I've grown "Food for Fuel" has evolved into "I exercise to eat".  I don't count calories or fat grams.  I eat pretty much whatever I want, when I want and I exercise to be able to do just that.  I've managed to maintain the exact same weight for over 3 years with only averaging 3 miles of running at least 5 days a week.  Now that I am faced with 13.1 leg cramping miles at once, will I be able to do that without changing my diet at all? 
   I feel like I have the same level of energy while running if I've eaten fruit for breakfast or if I've had one of the kids' brownie snacks.  I am well aware that the fruit sugars are way better for me than the refined sugars of the brownie.  Both are enjoyable and both will give me heartburn, so why change?
   Well, I am so freakin' nervous about this half-marathon that is in 83 days that I don't think I will change much. Why stress myself out more?  I do intend to give myself every possible chance of completing this thing in under 3 hours and without puking at the finish line.