“Marathoners die of heart attacks, too, occasionally young. Jim Fixx, author of The Complete Book of Running, a best seller in 1977, tragically died of a heart attack while out for a run. He was fifty-two years old. The conventional wisdom is that there are few things we can do that would be better for us, but we’ll never know for sure. We know that endurance runners seem to be very healthy, but that may not apply to us.” — Gary Taubes, “The Case for Keto”