Is the age-old fueling mantra of matching your fuel to your intensity really just a myth perpetuated by the supplement industry, or is there actual science backing the idea that we should be fueling differently for zone 2 versus high-intensity efforts?
It seems like every coach and nutritionist has a different take on this, with some swearing by the idea that you need to fuel with easily digestible carbs during high-intensity efforts, while others claim that as long as youre fueling adequately before and after your ride, it doesnt matter what you eat during.
And what about the role of fat adaptation in all of this? If were doing a lot of zone 2 work, are we really optimizing our fueling by shoving down a bunch of sugary gels and bars, or are we actually hindering our ability to adapt to burning fat as fuel?
Its also worth considering the differences between road and mountain biking in this context - if youre doing a lot of high-intensity efforts on the road, youre probably not going to have the same opportunities to fuel as you would on a mountain bike, where you might be stopped at the bottom of a climb or taking a break at an aid station.
So, should we be fueling differently for zone 2 versus high-intensity efforts, or is this just a bunch of unnecessary complication?