WSJ article is interesting but still in the anecdotal stage. Drinking a pepper shake during a ride is not my idea
of a solution. OTOH it has been more than 10 yrs since I had leg cramps. I never ride fasting after one brief
experiment ~2005 in July when I rode ~20 miles or so early on black coffee only and my blood pressure at
the end of the ride was ~80. FWIW bananas are high fiber sucrose with 7-10 meq of potassium.