These findings suggest that carbohydrate loading after hard sessions can cause supercompensation in muscle glycogen levels. However, the meta-analysis has several limitations that introduce substantial bias:

The authors only searched 2 databases, did not preregister their protocol, and made no risk of bias assessment.
A large number of included studies were before-and-after studies with no control group.
There was substantial variability among studies.
Data from female participants were sparse (only 48 women were included).

These limitations reduce confidence in the study’s main findings. However, prior evidence supports the superiority of a high versus a low-carbohydrate diet for increasing glycogen levels.^[1]

Carb loading supercharges muscle glycogen after exercise Original paper