Now, popular fitness app TrainingPeaks has launched a mighty intriguing—and potentially misunderstood—feature that could help serve this purpose: Fueling Insights. Developed with physiologist Dr. Iñigo San Millán, the tool promises to "translate your power meter data into precise estimates of carbohydrate and fat burn" during cycling workouts. It's innovative, scientifically grounded—and likely to be fairly misinterpreted by the very athletes it's designed to help.
How much carbohydrate you need to eat during those efforts is, of course, tied to how much you burn, so getting accurate estimates can help you to figure out how to fuel. Elite cyclists will do exercise tests in a lab to get estimates of their personal fuel use, but most casual runners and cyclists aren't doing anything of the sort.
The methodology is sound in principle. San Millán's research revealed consistent patterns: recreational athletes burn fuel differently than elite cyclists, and these differences are predictable enough to serve as the basis for reliable models. The higher your power output, the more your body shifts toward burning carbohydrates instead of fat—a well-established physiological principle that the algorithm attempts to quantify in grams per hour.
TrainingPeaks highlights how San Millán's work with Tour de France riders helped pioneer the current high-carbohydrate fueling strategies that have become standard in professional cycling. His lab findings directly challenged conventional wisdom and pushed intake recommendations from 35-55 grams per hour to 80-125 grams per hour.
How useful is this data?
The company acknowledges some key limitations, though perhaps not prominently enough. The model assumes a "fed state"—meaning it may be less accurate for fasted training. It's currently cycling-only, because running power meters lack the precision and adoption of cycling power meters. And most importantly, the carbohydrate burn numbers it produces represent what your muscles oxidized, not what you need to consume during the ride.
The fat burn numbers also shouldn't be taken as any kind of advice about how much fat should be in your diet. These fueling estimates are all about your body's internal accounting—what calories it draws from where during exercise—not about the balance of macros in your overall diet.
I'd add that the choice to separate users into four metabolic profiles add another layer of potential confusion. Athletes must self-select their category, but the distinction between "competitive" and "trained" isn't always clear, and getting this wrong could significantly skew your recommendations.
The bottom line
The science behind the launch of Fueling Insights is exciting. For coaches working with serious athletes, the tool could provide valuable insights into training stress and fueling strategies over time. But athletes and coaches should consider these numbers as rough estimates rather than precise prescriptions. The tool works best when viewed as part of a broader fueling strategy, not as a replacement for individual experimentation and common sense.
As with any new sports tech, the wise approach is cautious optimism. Consider the insights, but don't let them override years of proven fueling strategies and personal experience. And remember: No algorithm, however sophisticated, can replace the fundamental trial-and-error process of learning what works for you.
Fueling Insights is currently available to TrainingPeaks Premium users for cycling workouts with power meter data.
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