> The main reason for high carb diets is the energy to lift more. Body builders are physique athletes motivated by aesthetics. Assuming body builders do indeed

> The main reason for high carb diets is the energy to lift more. Body builders are physique athletes motivated by aesthetics. Assuming body builders do indeed prefer high carb diets, we currently have two hypotheses here: 1. They've tracked their energy levels and the data convinced them that high carb diets improved their energy levels in the gym, which ultimately improves muscle growth over the long-term (your hypothesis). 2. They are motivated by the clearly visible improvement in aesthetics (article's hypothesis). Gotta say the second seems more plausible on the face of it because it's directly tied to the motivation that defines this group, and doesn't require disciplined long-term data collection.