Whats the logic behind the conventional wisdom that zone 2 training requires a more carbohydrate-heavy fueling strategy, while zone 3 training can get away with a more balanced mix of carbs and fat, when in reality, the energy system utilization doesnt drastically change between these two zones?
Isnt it true that both zone 2 and zone 3 training rely heavily on the aerobic energy system, which can utilize both carbohydrates and fat for energy production, and that the primary difference between these two zones is simply the intensity of the effort, rather than a fundamental shift in energy system utilization?
Furthermore, doesnt the idea that zone 2 training requires more carbohydrates imply that athletes are somehow saving their fat stores for higher-intensity efforts, when in reality, the body is perfectly capable of utilizing fat for energy production at moderate intensities?
And what about the role of individual variability in fueling needs - shouldnt we be focusing on finding the optimal fueling strategy for each athlete, rather than relying on blanket recommendations based on arbitrary zone distinctions?
Can anyone provide a clear explanation for why the conventional wisdom around fueling for zone 2 and zone 3 training persists, despite the lack of clear evidence supporting these recommendations?