I'd say to avoid the sodas all together. Go with somehting that tastes good and will help you keep hydrated. Carbonated drinks not only don't aid in hydration but even cause your body to use up the water it does have at an accelerated rate. The caffeine accentuates this by speeding up your respiratory system.
"Avoid carbonated drinks, which can cause gastrointestinal distress and may decrease the fluid volume.
Avoid beverages containing caffeine and alcohol due to their diuretic effect. "
Jackie Berning, Ph.D., R.D.
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