WHO guidelines do not specify the Dissolved Oxygen content requirement in Drinking Water.
Is there any reasrarch done?

P.J.LAKHAPATE
plakhapate@rediffmail.com

I assume it would be best to have as little as possible, since it's an oxidant and all. Although I doubt that it would matter much, since I doubt you could dissolve enough oxygen in water to really increase the oxidative stress on your body.

I imagine that free-floating O2 would not pose a problem. Assuming it is absorbed by the digestive system it would be indistinguishable from O2 you breath once it's in the blood stream.

The air you're breathing isn't a problem, so dissolved oxygen shouldn't be.

Oxidation would be more likely to occur post-hydrolysis. An electron-hungry active group will sneak inside the cell and cause the problem. O2 is non-polar.

I suspect industrial or agricultural wastes in the food and water supply would be the culprit of disease.

i thought i remember hearing about water you could "breathe" and because it's oxygen content is so high you could actually derive your oxygen from this water in your lungs as long as you inhaled and exhaled it. sounds like it can't be too harmful for ya, but i dunno, i'd like to find more research on this but i can't find much

I imagine that free-floating O2 would not pose a problem. Assuming it is absorbed by the digestive system it would be indistinguishable from O2 you breath once it's in the blood stream.
Um...except of course that the oxygen you breath is bound to iron in your hemes, while this oxygen absorbed by the digestive system would just be floating around looking for something to redox couple with.

The air you're breathing isn't a problem, so dissolved oxygen shouldn't be.

Oxygen is poisonous - we've evolved to need it to live, but it's also terribly bad for you, which is why we have some many specialized enzymes to protect us from it. The air we breath is ultimately responsible for most of the oxidative stress that our bodies undergo.

Although I agree that it's very unlikely it would do enough damage to actually matter.