[dcasper70]

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In general, if you are not drinking enough water, your body will tell you.

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Unfortunately, most people don't recognize the signals the body sends, or attribute them to other causes.

I used to be a high caffeine guy. Three big cups of coffee by 10 am, mountain dew & cola's through the afternoon. When I felt worn down & tired, caffeine was my answer.
I switched to water when dieting about 5 years ago, and within a month I felt far more energized than I ever had during the caffeine days. No longer having that post-lunch fatigue wass the most noticable change.

These days when I don't drink enough, I can feel it and I understand what my body is telling me. If I never switched to water, I wouldn't know to attribute those feelings to dehydration.