"Excretory" will properly parallel "digestive." (Both adjectives) I believe the rest is okay. - A.
P.S. Where's the gerund?? If you said, "This is about overburdening your system," then "overburdening" would serve as a noun (gerund) as object of the preposition "about." As you have it, I suspect the whole ****** phrase to the end of the sentence serves as object. If you had to pi
I could be wrong. I see that part as a participial phrase modifying "food" or "sports food," therefore being adjectival in function. I understand that it's probably more about the "overburdening" than about the food, but I can't see the noun function.