Don’t forget that your body still requires fluid as our weather shifts into fall. It might not seem that hot now when you run but these final weeks leading up to the marathon still count for proper fluid intake. If you sweat profusely, check your weight change after your training runs and replace what you lost. Rule of thumb is to drink 20 ounces of fluid per pound of sweat lost. Your math is right that 16 ounces is a pound but the body requires additional fluid to process and replace what you lost. Keep you fluid intake in check and your training will remain solid.
Sloan Taylor, MS, CSSD, RD/LD, Board Certified Sports Dietitian