tyesai
Contributor
I agree with RoatanMan's advice up to a certain point. Assuming that we're talking about a healthy individual here...if one is thirsty, one should drink. However, there's a difference between being adequately hydrated and consuming too many fluids. People should know that bad things can happen if one over-hydrates.
If a diver normally drinks coffee or soda, I see no reason to abstain from caffeinated beverages on a dive day. The goal is to stay well-hydrated. A person can consume caffeinated beverages and still stay well-hydrated. Under normal circumstances, a significant increase in diuresis only occurs with high doses of caffeine.
Over hydration shouldn't be a concern unless your "not healthy". We did have an Airman die from overhydration several years ago in Basic Training, but dehydration is far more of a concern. I personally did not know how dehydrated I was until I started loosing weight and excercising twice a day. I started drinking at least a 80-100 ounces of water a day, and at first it was mildly annoying, but after a week I got used to it. After a about two or three weeks I could feel the difference, especially when I don't drink enough. Since my body has got used to being properly hydrated even slight dehydration is noticeable. A good example is when I get up and run a 5k first thing in the morning vs an afternoon run. I always feel better running after I can drink some water before hand vs waking up, taking a wiz and then going and running with out getting some water down.