G.I. issues and Ironman

I was having major GI issues with mostly when marathon training.  But I also experienced it with IM training.  It usually happens for me in the heat/ humidity moreso than in cooler, dryer temps.  I thought it was a hydration issues, but after trial and error I nailed it down to that, as well as the type of sports drink I was consuming. I found that Powerade had waaay too much sugar in it and not enough electrolytes and that was making me sick.  Gatorade was a little better but I still had stomach problems with that.  I also eat a lot of fiber and have tried to decrease my fiber intake and that has made a difference as well.  You might want to try altering a few things- like your gels, sports drinks, diet, etc and see if that helps.  Although since you're only a few weeks out from your IM you may not want to try something new. 

Edited:  I just noticed that you've only had the problems for the past 2 weeks.  Have you done anything different that could be the culprit?

Thanks for the reply...I haven't done anything different that I can think of (doc asked me the same thing)  I've used Hammer gels and drinks for the last few seasons and I have never had a problem with them.

Usually a sign of parasites/virus or you are not eating properly through out the day.

Did you change your diet??

No..my diet is the same as usual, pretty healthy overall.  Chicken, fish, a lot of brown rice and veggies and fruit.  Dont' drink that much alchohol and not really sure what to make of this.  Hope I can get some better answers from my doctor today as this will make my upcoming race a bit difficult.