My 11 lbs. He's trying to quit. I simply cannot train someone who swills carbonated beverages. The carbon dioxide in carbonated beverages is the same substance that your lungs exhale. That oxygen then gets into the bloodstream, picks up waste, and exits the body as carbon dioxide.
Carbonation is a waste product.
You might as well drink urine. Further, carbon dioxide immediately halts protein digestion. Prove it to yourself. Eat a steak with a carbonated beverage. You'll notice the next morning that the meat is not digested, it lays there in your stomach.