There aren’t a lot of studies on the effects of carbon dioxide from carbonated beverages. Here’s one from 1991 for someone’s college thesis, I fell asleep three times waiting for it to download. If you want some information on oxygen transport factors under stress / exercise, and their relation to hemoglobin , get in here.

If you have some kind of underlying hemoglobin issue, be it “COVID” or oxidative stress from radio energy (note: I’m not speculating “5g” without a specific reason for doing so) or some mystery injected substance shredding your red blood cells, I dont see carbon dioxide (read: soda) being good for you if you’re already on the edge. Any of these – or some combination thereof – might be why athletes are dropping on the field.