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This chapter summarizes the important recent epidemiologic evidence on the health effects of these behaviors.We’re all aware of the importance of drinking enough water for our overall health, not least for helping maintain bodily functions including regulating our temperatures and aiding digestion. But what about water’s benefits for our skin on the surface; can we really

Many refinements in knowledge have occurred since then. Causal conclusions have been strengthened by more sophisticated research designs, dose/response relationships have been clarified, the influence of many of these behaviors on overall public health has been quantified, and scientific guidelines have been formulated. This chapter summarizes the important recent epidemiologic evidence on the health effects of these behaviors.