Well, yes you can exercise too much, but it doesn't sound like that's your situation.
The simplest way to know if you're eating "enough" is calorie counting IMO. I like using My Fitness Pal to track my calories and my calories burned. How many of those calories burned you should "eat back" is highly personal and dependent on how much weight you have to lose and what kind of exercise you're doing (i.e. cardio/endurance vs strength training or HIIT).
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My Journey
268 lbs - Journey Begins (January 11, 2006)
197 lbs - 71 lbs lost (October 15, 2007)
247 lbs - 50 lbs gained pregnancy (August 22, 2008)
195 lbs - baby weight gone (July 7, 2009)
168 lbs - 100 lbs lost (March 26, 2010)
148 lbs - GOAL! 120 lbs lost (July 18, 2010)
138 lbs - 10 lbs under goal (December 29, 2010)
2nd 1/2 Marathon - Time 2:15:36 (August 14, 2011)
1st Full Marathon - Time 4:40:53 (March 18, 2012)
Today 140s & training for ANOTHER 26.2
"There is nothing you can't have tomorrow so there is no reason to eat it all today."
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