"The increased value of health and wellness in America and the world today has been matched by an ever increasing amount of misinformation related to health and health products. This incorrect information is more readily available than the true scientifically proven information that people really need. The public’s enthusiasm for healthful living, improved wellness, and a reliance on self-help creates a receptive audience for dissemination of this misinformation. Thus it is extremely important for educators in health, physical education and the health professions to help students/clients analyze the information that is publicly available, recognize errors, understand that different opinions may exist, and think critically about important issues in health." -- retired Professor Randy Davidson.
The three main types of information out there are Popular, Trade and Scholarly. You can find good information in all three, but it's important to be aware of what type of publication you're reading and how you might want to use it in your research.
Always remember to cite ALL of your sources, even images, websites and charts! Here are some good online guides to APA-style citations.