text: Congrats on changing your lifestyle.\n\nLong runs  10K and longer can be very taxing on the body.  You should start to hydrate with lots of water 7-10 days before the run.  Watch your salt intake.  Increase your protein intake slightly for a day or so before the race.\n\nOn race day, don't starve.  Eat complex carbs, a banana, stay away from fats.\n\nMost of the time drinks like Gatorade contain too many salts depending on the race conditions.  Mix it 1/2 and 1/2 with water during the race and have fun.