Runner's Fatigue and Diet

Patient : Hi! i have been a runner for about 30 years now. i am nearing 50 years of age. i ran my first and only marathon last year in april. increasingly over the past year, i have noticed that i become fatigued and winded during some of my runs. this doesn't happen every time i run, but it seems to be happening more and more frequently. in fact, today i had to stop 3 or 4 times during my 6 mile run due to being fatigued and winded. i don't have any chest pains or anything.....just winded and fatigued. when i have annual blood tests, there are times that my hemoglobin levels are borderline low. could this be a cause? also, i have a pretty high fiber diet...i eat a big bowl of oatmeal every morning, and i usually have 3 or 4 pieces of fruit every day, and also a big salad for dinner with lots of fresh veggies included. my weight is 172 lbs. i am not a fitness and diet freak.....i'll eat anything my wife puts in front of me. :) the only change in my diet over the past year (since i ran that marathon) is that i eat a big salad for dinner every night (with whatever else my wife serves for dinner). could the high fiber be causing me to be anemic? i don't detect any blood loss in my stools, etc. please respond.
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