"The basic deficiency in beverages such as Gatorade for illness-related dehydration is that there is too much sugar and not enough salt (sodium) or potassium,"

https://vitalrecord.tamhsc.edu/sports-drinks-not-solutions-illness-related-dehydration/

from the CDC "You should not provide drinks with a high sugar content, such as juice, soft drinks, or sports drinks, because they could worsen diarrhea"

https://www.cdc.gov/cholera/treatment/rehydration-therapy.html#:~:text=Give%20oral%20rehydration%20solution%20(ORS,because%20they%20could%20worsen%20diarrhea.