When you click on the title of an article from the results list, you will find "Full Text Links" to the right of the title.
Under "Full Text Links" you will often find a publisher link (which will link you out to the article publisher's page where you will be asked to pay for the full text), sometimes you will find a PMC Full Text link (this will take you to full text in the PubMed Central open source database), and a red circle that says "Find It" (this is the interlibrary loan link, which will either take you to another article UD subscribes to with the full text or a link to request the item through interlibrary loan). If you request an article through interlibrary loan, you will receive a PDF of the article in your UD email inbox typically within 1-3 business days.
Search first and then use the filters on the left hand side.
Use Mesh terms. Search for the correct Mesh terms for your topics using the Mesh Database from the PubMed homepage.
Pay attention to the connection between either prevention or treatment and nutrition.
Read the abstract, keywords, and subject headings to gain a better understanding of the article and its contents.