I spent the last few years training for longer duration endurance type rides in preparation for 2024 Unbound. In that time I ate just about anything and everything you can imagine on longer rides and only found 1 drink mix i couldn’t stomach. With the one exception I never had any gut issues. Even on the hard interval days the gels and drink mixes didn’t give me any problems.
Fast forward several months and I am doing much more intense MTB rides and races that are about 1-2 hours in duration. The shorter/harder efforts seem to cause a lot of gut distress with anything I am trying like Gatorade or Tailwind and solid food is out of the question. None of these calorie sources are new to me.
Any suggestions on gut training for this type of scenario? Would simply increasing the mix in the bottle slowly over a period of time work to adapt? Right now anything other than water during race paced training is a no go to the point of vomiting on the side of the trail.