PubMed Central, a digital archive of biomedical and life sciences journal literature, providing free access to the full text of articles. Search the full PubMed to access all the 19 million citations for articles on medicine and the life sciences. Use Holman Library's Journals List to see if full text is available.
This division of the Centers for Disease Control and Prevention gathers statistics on all manner of health topics, from aging and birth rates to diseases and physical activity. The place to start looking for health statistics.