I am in full training for Ironman Louisville, my first Ironman, as well as my first long race since being diagnosed in December. I will have to agree that the Lara Bars are just not enough on a 5 hour ride ... I have been using the Pure Fit Bars, they taste alright and have a lot more nutrition. They are great in the heat, they do not melt and hold up really well. Best all around bar in my opionion. http://www.purefit.com/store/ I also use the Zone Perfect bars, I have called the company and a couple of the bars are gluten-free, I have been using the Fudge Graham and never had a problem ... just be careful in the heat, they can get messy. http://www.zoneperfect.com/ Give them a try ... hope that this helps.