The only DNF I've ever had on a century ride is when I tried to maintain ultra low carb standards on the ride, bonked about 68 miles in. I now take some Mothers cookies in the foil packs to keep me fueled. On centuries I will use Gatorade?Powerade etc. but if I'm less than 75 miles I stick to water and Salt Stick caps. You'll burn off all the carbs as you go and get back on the low carb bus easily. I've been Paleo/Atkins for several years now.